Listen to What Took You So Long (Professional Backing Track) online. What Took You So Long (Professional Backing Track) is an English language song and is sung by You Entertain. What Took You So Long (Professional Backing Track), from the album Female Solos - Professional Backing Tracks, Vol. 2, was released in the year 2013. The duration of the song is 4:02. Download English songs online from JioSaavn.