A gospel choir appears in Sam Smith's "Stay With Me" video, but the vocals on the song are all Smith - about 20 tracks of his voice were used to make him sound like a chorus.
"Closing Time" by Semisonic was written by the lead singer when his wife was pregnant. Some of the lyrics are about being born.
The Black Eyed Peas shot the video for "Just Can't Get Enough" in Japan just a week before a devastating earthquake hit the country.
"We Are Never Ever Getting Back Together" by Taylor Swift earned an entry in the 2014 edition of the Guinness Book of Records for the fastest-selling digital single. It reached the #1 spot on iTunes just 50 minutes after its release.
"Izzo (H.O.V.A.)" refers to "Hova," which is what Jay-Z calls his God Name. Jay-Hova, as in Jehovah.
Pink Floyd's "Run Like Hell" was released as a single in America because it has a catchy beat, but the lyrics describe a reign of terror instigated by the despot Pink, the main character in the concept album The Wall.
An interview with Frankie Valli, who talks about why his songs - both solo and with The Four Seasons - have endured, and reflects on his time as Rusty Millio on The Sopranos.
Richard explains how Joe Walsh kickstarted his career, and why he chose Hazard, Nebraska for a hit.
His keyboard work helped define the Muscle Shoals sound and make him an integral part of many Neil Young recordings. Spooner is also an accomplished songwriter, whose hits include "I'm Your Puppet" and "Cry Like A Baby."
Rob Halford, Richie Faulkner and Glenn Tipton talk twin guitar harmonies and explain how they create songs in Judas Priest.
The Nails lead singer Marc Campbell talks about those 44 women he sings about over a stock Casio keyboard track. He's married to one of them now - you might be surprised which.
Martyn talks about producing Tina Turner, some Heaven 17 hits, and his work with the British Electric Foundation.