Miguel wrote "Adorn" about his girlfriend, model and artist Nazanin Mandi when he was returning home from a long trip and was anxious to see her.
Sam Smith's "Writing's On The Wall" was the first ever James Bond theme song to reach #1 in the UK.
"Mercedes Boy" by Pebbles is about a real guy she fell in love with - they both drove Mercedes when she wrote it.
Katy Perry's song "E.T." came from a beat originally intended for the rap group Three Six Mafia. When her producer accidentally pulled up the beat, Perry asked to use it.
Angus Young created the distinctive opening guitar part for "Thuderstruck" by playing with all the strings taped up, except the B. He learned the studio trick from his older brother George Young, who was the rhythm guitarist for The Easybeats.
Pat Benatar's "Hit Me With Your Best Shot" was written by a guy named Eddie after going through a weird therapy session where he punched pillows to get out his aggressions.
Gramm co-wrote this gorgeous ballad and delivered an inspired vocal, but the song was the beginning of the end of his time with Foreigner.
"When seeds that you sow grow by the wicked moon/Be sure your sins will find you out/Your past will hunt you down and turn to tell on you."
Smith breaks down some of his worship tracks as well as his mainstream hits, including "I Will Be Here For You" and "A Place In This World."
Famous songs that lent their titles - and in some cases storylines - to movies.
Tom talks about the evolution of Cinderella's songs through their first three albums, and how he writes as a solo artist.
Cain talks about the divine inspirations for "Don't Stop Believin'" and "Faithfully."