When Michael Jackson passed in 2009, Justin was 15. In 2010, Jerkins (who produced "You Rock My World" for MJ) brought Bieber into the studio to record a tribute. "Angels Speak" uses a spoken-word intro about meeting your heroes, followed by a soaring gospel-tinged chorus.

The label scrapped it for being "too aggressive" for his image. The leaked rock mix shows that Bieber had always wanted to dip into the Paramore/Fall Out Boy lane but was held back. The drums in the final chorus hit like a freight train. 5. "Just For Show" (feat. Sean Kingston) Status: Unreleased / Full Leak (December 2010)

Listening to "Where Are You Now?" or "Red Eye" is like opening a time capsule filled with Sidekicks phones, neon shutter shades, and Myspace bulletins. They are rough, unfinished, and sometimes embarrassingly earnest. But for a true Belieber, that is exactly why they are perfect.

Fans know the acoustic version of "Stuck in the Moment" from My World 2.0 . However, the unreleased original was a full-band, pop-rock belter produced by The Messengers. It featured electric guitars distorted through a Marshall amp and a bridge where Bieber actually screams (something he wouldn’t do again until "Boyfriend" in 2012).