Are TWICE Only Popular Because of This Foreign Music Composer? It shouldn't be a surprise - many K-Pop songs aren't made in only Korea anymore! A lot of other producers, such as BTS' popular American producer/lyric composer Melanie Fontana, have joined the K-Pop scene and turned it into something even more fresh, alive, creative and fun! Of course, TWICE gained popularity for many reasons but their hit songs sure did make loving them even easier! Check out our latest interview with music producer David Amber, the genius behind hit songs such as TWICE's "YES or YES" and "Heart Shaker"! David Amber has created numerous hit K-Pop songs, as well as J-Pop songs, for artists such as AOA, GFriend, EXO-CBX, B.