What is "b-side"

n. 1 The reverse side of a phonograph record, especially of a vinyl single. 2 Any song included on a compact disc single, besides the first song (the A-side).

B-SIDE is a compilation album by Mr. Children, released on May 10, 2007, marking the fifteenth anniversary of their first album's release. It collects all of the group's B-sides, with a booklet providing liner notes for each of them.

A promotional video was created for the song to promote this compilation.

B-Side is a premiere five song extended play by Chinese-American artist Baiyu released on December 07, 2010 via the artist's Bandcamp page. Most of the songs from this project were completed during her 6-month stay in Kauai, Hawaii where she also completed the filming for an independent film, along with a music video for the single "Sweet Misery". While in the mountains of Kapaa, Baiyu also took this opportunity to record a remix version of Ryan Leslie's song "When We Dance", for which a video was also released, and subsequently featured on The Fader Bossip and the likes. Though "When We Dance" was not featured on the mixtape itself, it was one of the catalysts for launching Baiyu's music career into the public eye.