The K-Pop group “Big Bang” has become synonymous with great K-Pop music the world over.  But did you know that many of the soundtracks (OSTs) to your favorite Korean and Japanese Dramas were sung by Big Bang members?  Here are 6 times Big Bang Sang Your Favorite OST. “Because” from 19 (KDrama) Singer: T.O.P T.O.P brought more than fabulous hair…