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 fadeout on Drake's "Hotline Bling" lasts 55 seconds - one of the longest outros of any hip-hop hit.
Buck Dharma of Blue Oyster Cult wrote "(Don't Fear) The Reaper" after he was diagnosed with a heart condition and started thinking about his own mortality.
Feist's "1234" is "about lost love, and the hope to recapture what you once had," but it's best known for the Sesame Street version about counting to four.
"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 Cave" by Mumford & Sons is based on the philosophy of Plato and his work called "Allegory of the Cave."
Glen Ballard talks about co-writing and producing Alanis Morissette's Jagged Little Pill album, and his work with Dave Matthews, Aerosmith and Annie Lennox.
The hitmaking songwriter/producer Sam Hollander with stories about songs for Weezer, Panic! At The Disco, Train, Pentatonix, and Fitz And The Tantrums.
These Three famous songs actually describe how they were written - late into the evening.
Roger reveals the songwriting formula Clive Davis told him, and if "Eight Miles High" is really about drugs.
Laura Nyro talks about her complex, emotionally rich songwriting and how she supports women's culture through her art.
Cain talks about the divine inspirations for "Don't Stop Believin'" and "Faithfully."