Let's Fly is the first mini-album released by B1A4 under WM Entertainment on April 21, 2011. The songs were mainly composed by Lee Sang-ho but Im Sanghyuk (Beast’s main songwriter) and Jeon Dawoon (K.Will’s main songwriter) have participated in the album along with all the members especially Jinyoung who was directly involved with the songwriting. All rap lyrics were written by Baro.