Katy Perry co-wrote Iggy Azalea's hit single "Black Widow." Perry was originally going to sing on the track, but she couldn't fit it into her schedule, so Rita Ora provided the sung vocals instead.
"Crazy Train" by Ozzy Osbourne is about the Cold War concept of Mutually Assured Destruction (M.A.D.) should any nuclear missile be fired.
The 2001 Dirty Vegas hit "Days Go By" was written by their lead singer when he was longing for his ex-girlfriend. The sad song gave him a happy ending though: They got back together after it was released and eventually got married.
"Sister Christian" was written by Night Ranger drummer Kelly Keagy, who was imploring his younger sister to be careful in her reckless youth, especially when "motoring" (driving around) with friends.
Eric Clapton wrote "Wonderful Tonight" while waiting for his girlfriend, Pattie Boyd, to get ready for a night out. By the time she was ready, he had written the song.
Roger Daltrey stutters the vocal on "My Generation" by The Who. The idea was to sound like a British kid on speed.
Tyler talks about his true love: songwriting. How he identifies the beauty in a melody and turns sorrow into art.
John tells the "St. Elmo's Fire (Man In Motion)" story and explains why he disappeared for so long.
Songs about drugs, revolution and greed that have been used in commercials for sneakers, jeans, fast food, cruises and cars.
Daniel Lanois on his album Heavy Sun, and the inside stories of songs he produced for U2, Peter Gabriel, and Bob Dylan.
The Scorpions and UFO guitarist is also a very prolific songwriter - he explains how he writes with his various groups, and why he was so keen to get out of Germany and into England.
Dan cracked the Top 40 with "Ritual," then went to India and spent 2 hours with the Dalai Lama.