Imagine Dragons lead singer Dan Reynolds says their 2012 hit "Radioactive" is "a song about having an awakening; kind of waking up one day and deciding to do something new, and see life in a fresh way."
The "Don't Stop Believin'" lyric was inspired by Sunset Boulevard, making it perfect for the Rock of Ages musical.
Meghan Trainor and her producer Kevin Kadish wrote "All About That Bass" for another artist to record, but after Epic Records boss LA Reid heard Meghan play a demo of the song on a ukulele, he signed her to his label and told her she should sing it.
The hit duet "Somewhere Out There" was written for an animated film about a family of immigrant mice who lose one of their young.
The bedrock of David Guetta's Nicki Minaj-featuring single "Hey Mama" is a sample of "Rosie," a 1940s prison recording from folk archivist Alan Lomax that songwriter Esther Dean first showed the French DJ on YouTube.
Dave reveals the inspiration for "Feelin' Alright" and explains how the first song he ever wrote became the biggest hit for his band Traffic.
How did The Edge get his name? Did they name a song after a Tolkien book? And who is "Angel of Harlem" about?
Michelle Branch talks about "Everywhere," "The Game Of Love," and her run-in with a Christian broadcasting network.
Outrageously gifted and just plain outrageous, Millie is an R&B and Rap innovator.
These Three famous songs actually describe how they were written - late into the evening.
Jim talks about the impact of "The Middle" and uses a tree metaphor to describe his songwriting philosophy.
