The temperature outside was over 100 degrees, but the singers onstage at the Fantasy Springs Resort Casino were hotter: Lyn, Isu and Kim Tae-woo, presenting a night of Amour. Showcasing a range of styles from R&B to pop, bossa nova to gospel-tinged funk, these three power vocal veterans performed an unforgettable collection of love songs to a delighted audience.

The audience was a little restless, as the start time for the concert had been pushed back with no explanation. All was forgotten when, with no particular fanfare, Lyn appeared onstage, captivating in a red pantsuit and glittering jewelry, and launched into her first song, "My Destiny," the theme song from the hit drama, You From Another Star.

Since her debut in 2000, Lyn has grown to commandeer a spot among the top female vocalists in South Korea, particularly in the OST, or original sound track, category. There was no band, no back up vocals, no choreographed dancing, nothing but a video montage of clips from the drama on the background screen to distract from Lyn's voice. The tremulous, whispery quality to Lyn's voice on certain recordings belie the true strength of her voice as it soared over the crowd.

"Sorry for the late start, it must have been uncomfortable. I am Lyn," she introduced herself, bowing. To a shout of "You're pretty!" from an audience member, she whimsically replied, "Thank you, it's the make up!"

Lyn wasn't pulling any punches as she began her second song, "Back In Time, the theme song from another hit drama, Moon Embracing the Sun.

"Both of these songs are familiar because they are number one songs. I seem to have a good connection to Kim Soo-hyun," she said and laughed, referring to the star of these two dramas.

"This stage is so special, because I'm sharing the stage with two good friends, one of whom is my husband. But I'm still nervous," she confessed. Her nerves didn't stop her from cheerfully greeting latecomers, who were trying to sneak into their seats up front. "Hello, welcome, you missed two good songs already."

Her cute energy overflowed into her next song, "Honey, Baby, Love," into which she sprinkled some aegyo, or cutesy, hand movements, dimpling her cheek with her finger and waving to the audience.

Up until now, Lyn had been performing on stage alone to a backing track, but at this point, a band appeared behind her, consisting of two keyboardists, a guitarist, a bassist, a drummer and a saxophonist. After chatting lightly with the audience and with a stagehand who brought her some water, she settled onto a stool to sing Nat King Cole's "L.O.V.E." in English.

Sometimes, songs sung by singers whose first language is not English get muddled in performance, but Lyn had obviously put a lot of effort into her English pronunciation. The lyrics were clear and smooth.

"I don't usually get a chance to sing classics like this. So how do you like it?" she asked the cheering audience.

Up until then, Lyn had shown us a fun and flirty performance. At the next song, she turned up the heat. To the waving of glow sticks and a moving saxophone solo, she sang a stirring cover of Baek Ji-young's "Don't Forget" from the IRIS OST.

To cut the emotion, she bantered with the audience, calling the Californian desert heat "sexy, not humid or sticky," and apologizing for her decidedly static stage. "I'm sorry I don't dance, but if I danced, you'd want to go home!"

Continuing the slow burn, she sang "One Fine Spring Day," the theme song to the 2001 movie of the same name. Lyn had recently appeared with this song on the music program, King of Masked Singers, in which singers perform in masks, leaving the audience to guess who they are by their vocal talent alone. Lyn's tight control of the haunting minor melody and the understated restraint of her voice in this song proved Lyn has no need of flashy choreography to rivet listeners to their seats.

Adding background singers for the first time, she bid the audience goodbye with her first hit, 2004's "We Were In Love." The band remained on stage as Lyn disappeared offstage, like a good first date, leaving us wanting more.

Boasting seven albums and multiple singles since their debut in 2000, rock group M.C. the Max are best known for their rock-infused ballads. Frontman and lead singer Isu, dressed in a beige suit and sunglasses, took the stage with a song off their seventh album, "Us Back Then." His long stage experience served him well; when a techno backing track briefly broke into his performance, it didn't faze him at all.

"Since I was born, this is my first visit to the U.S. ever," he shared with the audience. He also apologized for the concert's late start. "I will put on a concert that will make up for it," he vowed. "The next song I have not even performed in Korea," as he went on to sing "Because Of You" from The Girl Who Sees Smells OST.

Having never been to Los Angeles, Isu joked that he prepared for his trip by taking a drive around the Los Angeles depicted in the video game, Grand Theft Auto. As he did so, he wondered, what would it be like to live here? A voice shouted, "Please come!" as Isu laughed and said, "Maybe in the future."

Turning in a different direction, Isu's next song had a quirky title as well as a quirky bossa nova beat, "Sunflower Gets Neckache." Though he punched the air and tapped his feet, Isu did not seem totally at home in this more upbeat song.

He quickly brought it back to his comfort zone with the ballad, "Don't Be Happy." In the middle of the song, in an un-rocker-like move, he removed his sunglasses and pointed his mic at the audience, which sang along to the chorus of this popular song.

Isu had not moved from the center of the stage in his entire set, but perhaps feeling freer after the crowd's positive reaction to the last song, Isu sang "Love Is Time" while walking around the stage. Waving to the audience, he stopped singing to ask, "Can you see me well?" Featuring an appealing falsetto section, this last song in Isu's set was delivered like a warm farewell.

Kim Taewoo, soulful lead singer of national pop group g.o.d., short for groove overdose, apparently did not care about the incongruity of singing a song entitled "Friday Night" as the opening song of a Saturday night concert. Taking an applause break mid-song, he ordered the audience, "Scream, or I won't sing! You ready?" before having an impromptu dance-off with the soloing saxophonist.

Completely comfortable on a solo stage, he swaggered back and forth in his natty royal blue suit and polka dot shirt, belting out all the ad libs one wants to hear from him that he holds back when he's performing with his group members, so as to not overshadow them.

"Singing hiphop, singing R&B, singing ballads, I'm funk!" he trumpeted, going straight into his second song, "Lonely Funk" off his recent fifth album, T-Road. Still grooving to the gospel organ sounds of the keyboardist, he gave his introduction, sprinkling random English phrases throughout.

"How ya doin'? Tonight's a joyful night. Release all your stress, forget all your bad memories, take only good feelings from this Lyn, Isu, Kim Tae-woo concert," he said.

"When I have to drink water it's awkward, so cheer for me when I have to do it," he joked, taking a couple of swigs from a bottle. Mirroring his infectious energy, the crowd enthusiastically played along.

"Ride the music time machine with me. We're going back 17 years. What were you doing 17 years ago? There are some in the audience that probably weren't born yet. You all know this song. Sing it with me," Kim Tae-woo said, in preparation for a g.o.d. hit medley set of "To Mother," "Love and Remember" and "Lies."

"You make me cry a little," he told the singing audience. "Good job on the chorus."

Though Kim Tae-woo is not a rapper, his effort was welcome as the audience was clearly moved by this set. However, he could not stem his exuberance for long.

"I'm going to drink water now," he announced, turning his back to the crowd as they remembered his earlier request and began cheering. "I got the sexy back."

As he drank, an excited fan yelled, "Sing Love Rain!" to which he quickly shot back a tongue-in-cheek reprimand, "Wait a minute, please. Don't worry. I have to sing Love Rain, because, you know, that song is a megahit!" Amid laughs, he wrapped up the set with g.o.d.'s emotional ballad, "Road."

As the organ kept playing, he began a lengthy conversation with the rapt audience. Half-singing the words in ad libs over the music, in the funniest concert segment, he conducted his Lucky Girl fan service event.

"Did you, by any chance see the box for collecting your phone number on the way in?" he asked. At the Will Call desk, there had been a shoebox for collecting phone numbers (Girls Only, the sign on it said) for an event that Kim Tae-woo would do during the concert.

"Oh baby, give me your number. If you didn't write down your number, you will regret it. You should give it to me when I ask for it. Where is phone number?" he crooned, holding out his hand to receive a brown shoebox from a stagehand.

"What is this box? This isn't right. It's a sneaker box. It's not even Nike. Oh my god," he continued to sing, while half the audience laughed and the other half moaned in regret. 

"Phone number please, girls only, that's weird! No wonder nobody put their number in. Whatever. I'm going to call some lucky girl's phone number from this box now and bring her on stage," he continued, as the fans continued to laugh and shriek. He rifled through the slips of paper in the box and chose one.

"There is a name I recognize, a familiar name. I'll pick this one. Are your phones on? Turn on the phone, baby." The band stopped playing as he dialed the chosen number on his phone.

He motioned for the keyboardist to go on. "Keep playing, baby. I need more...sexy mood...Hello? Hello? Hello? What is your name? Just talk to me. Sexy mood. Now baby yeah, where are you? Don't be shy, baby. Come on, come on to the stage," he sang, as a girl walked up on stage.

As he seated her on a stool next to him, he greeted her in English, "What's up? In the movies, they say that." Addressing the audience, he said, "You're going to be surprised at her name. Moon Hee-won. The name that I know is...Moon Hee-jun!" (Moon Hee-jun is the leader of first gen idol group H.O.T.)

Kim Tae-woo had the audience eating out of the palm of his hand. "Don't be sad. When I come back, next time, I'll do this again. With a proper box!" he reassured the jealous audience members, before grabbing Hee-won's hand and serenading her with the song, "If It's The Two Of Us."

Not to be outdone by Lyn and Isu, Kim Tae-woo displayed his OST chops with the songs, "Dream a Dream" from the IRIS OST and "High High" from A Gentleman's Dignity OST, before winding down to his final address.

"Sing along with me, with no regrets. This is..."Love Rain," he announced to wild applause, closing out his main set with a decisive bang. He returned to shouts of "Encore, encore," to perform "Words I'd Want To Say," and the thrilling night of Amour was over.

A slight disappointment was that there was no encore to be had from the other singers, nor any collaboration stages. Kim Tae-woo and Lyn have performed duets in the past, after all. And what better way to celebrate Isu's first trip to the U.S. by performing on stage with his new wife? The audience did wait a little expectantly after Kim Tae-woo's second exit, but dispersed when the house lights came up.

All in all, the Amour concert was a thrilling showcase of three extremely talented veteran singers, whose vocal chops are unmistakable. From movies to television to Youtube, their voices pervade our emotional landscapes, and their songs remain the soundtrack to our loves.