When Girls' Generation released the dark electro dance single "Mr.Mr." back in February, fans were polarized.

While many praised Girls' Generation for pushing boundaries, both with a hard-hitting new style and a haunting, medically themed video, others derided the group for abandoning their trademark sound. Gone was the light pop sound of their early material like "Gee" or "Oh," replaced with a harder beat and a more raw production style.

It is a trend that the so-called "sub-unit" of the group, Girls' Generation-TTS, has continued on "Holler," the title track off of their second EP, released on Tuesday.

And even the most traditionalist sone has to admit that like their original band, though Girls' Generation-TTS may have drifted from the sunny side of the street, they still sure make you want to drift toward the dance floor.

On "Holler," Girls' Generation-TTS, comprised of SNSD band members Seohyun, Taeyeon and Tiffany, put in powerhouse performances on the mic.

Like Girls' Generation, this trio seems to be bored with making upbeat, in-the-pocket-yet-predictable pop. If you compare "Holler" to the sub-unit's 2012 single "Twinkle," Girls' Generation-TTS appears to share the larger group's interest in exploring a sound more evocative of the late night hours of an all-night dance party.

Proof that the nine-piece band could be moving in a more ferocious direction can be heard as early as 2011 in places like the gut punch of an intro to the song "The Boys," but it is only the last few releases that have remained noir-ish throughout the entire proceedings.

Obviously, that's not to imply that Girls' Generation and Girls' Generation-TTS are the same band.

One thing that has always separated TTS is their gigantic beat. There is an old adage about dance music that if the drums sound good, that's all you need. While there is a lot more than a great drum sound here, the snare has a satisfying snap and the bass drum is thunderous.

The overall production marries electro, traditional K-pop, American hip-hop and R&B sounds without ever feeling forced or overstuffed.

It is difficult to know what exactly what is behind Girls' Generation-TTS and their other band's walk on the wild side, but this reviewer hopes it's a long walk.

Check out the music video for the new Girls' Generation track "Holler" RIGHT HERE