The Christian rapper talks about where his trip to Haiti and his history of addiction fit into his songs.
Before he was the champ, Ali released an album called I Am The Greatest!, but his musical influence is best heard in the songs he inspired.
From NKOTB to 1D, how well do you know your boy bands?
JJ talks about The Stranglers' signature sound - keyboard and bass - which isn't your typical strain of punk rock.
The lead singer and pianist for Procol Harum, Gary talks about finding the musical ideas to match the words.
Brian has unearthed outtakes by Fleetwood Mac, Aretha Franklin, Elvis Costello and hundreds of other artists for reissues. Here's how he does it.