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."
Freddie Mercury considered "We Are The Champions" his version of "My Way." "We have made it, and it certainly wasn't easy," he said.
Irving Berlin said "God Bless America" was "not a patriotic song, but rather an expression of gratitude."
"Airplanes" by B.o.B was written by Lupe Fiasco, who recorded it but decided to pass.
The MTV classic "Voices Carry" is by 'Til Tuesday, a group fronted by Aimee Mann. She wrote the lyric about a friend who's partner wanted to keep their fling a secret.
Otis Redding often ad-libbed vocals at the end of songs, but for "(Sittin' On) The Dock Of The Bay" he just whistled instead - it became some of the most famous whistling in song history.
Find out how God and glam metal go together from the Stryper frontman.
MTV, a popular TV theme song and Madonna all show up in this '80s music quiz.
Starting in Virginia City, Nevada and rippling out to the Haight-Ashbury, LSD reshaped popular music.
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?
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."
The co-writer/guitarist on many Alice Cooper hits, Dick was also Lou Reed's axeman on the Rock n' Roll Animal album.