"Sing" was inspired by a girl that Ed Sheeran met in Las Vegas in the summer of 2013, when "one thing led to another and now she's kissing my mouth."
"Call Me Maybe" by Carly Rae Jepsen was the song of the summer in 2012 and a major meme. It got some help from her fellow Canadian Justin Bieber, who tweeted that it was "possibly the catchiest song I've ever heard."
AC/DC's "For Those About To Rock (We Salute You)" is titled after a phrase Roman gladiators said heading into battle: "We who are about to die salute you."
"Whole Lotta Love" was Led Zeppelin's only US Top 10 hit, charting at #4. Many of their songs, including "Stairway To Heaven," were not released as singles, as it was considered bad form in the UK to make fans pay for singles that were also on albums.
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.
"Are You Gonna Go My Way" by Lenny Kravitz is from the perspective of Jesus Christ: "I am the chosen I'm the one."
Justin wrote the classic "Nights In White Satin," but his fondest musical memories are from a different decade.
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.
If the name Citizen Dick means anything to you, there's a chance you'll get some of these right.
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.
The Bush frontman on where he finds inspiration for lyrics, if his "machine head" is a guitar tuner, and the stories behind songs from the album The Kingdom.
The Creed lead singer reveals the "ego and self-fulfillment" he now sees in one of the band's biggest hits.