Taylor Swift became the first ever female in the history of the Hot 100 to succeed herself at #1, when "Blank Space" dethroned the songstress' previous single, "Shake It Off" from the top spot.
When "Baby Love" reached the top spot, The Supremes became the first Motown act with two #1 hits on the Hot 100.
"Veronica" was inspired by Elvis Costello's grandmother, who suffered from Alzheimer's disease.
Will.I.am, literally dreamt up "I Gotta Feelin'." Said the Black Eyed Pea: "Have you ever had a dream where there's a melody in your dream? I'll wake up out of my sleep and record that! 'I Gotta Feelin' was one of those songs."
Mark Ronson's "Uptown Funk" was the first US chart-topper to include the word "funk" in the title.
Scott Stapp of Creed wrote "With Arms Wide Open" when he found out he was going to be a dad. He named his son Jagger.
Before he was the champ, Ali released an album called I Am The Greatest!, but his musical influence is best heard in the songs he inspired.
Pool balls, magpies and thorns without roses - how well do you know your Tom Waits lyrics?
As a songwriter and producer, Narada had hits with Aretha Franklin, Whitney Houston, Mariah Carey and Starship. But what song does he feel had the greatest impact on his career?
Rockers, rappers and pop stars have been known to quote the Bible in their songs. See if you match the artist to the biblical lyric.
A selection of songs made to be terrible - some clearly achieved that goal.
