According to the liner notes of Journey's Time3 compilation, Journey often reworked ideas in recordings until the band was satisfied with the results before committing them to vinyl. "Velvet Curtain" was an early instrumental that stayed on the shelf until keyboard player Gregg Rolie took it down and sculpted the track into a song entitled "Let Me Stay," which was almost included on the "Next" album and only pulled off at the last moment. When Steve Perry came onboard, he rewrote the track again, adding a fresh chorus, and shared lead vocals with Rolie on the version that finally made it to record and the concert stage repertoire.
"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 England to make people pay for singles that were on albums.
There was a rumor in the Soviet Union that The Beatles had secretly visited the U.S.S.R. and given a private concert for the children of top Communist party members. They believed the song "Back In The U.S.S.R." was written because of the concert. Actually, some fans still believe so.
The TV show Cheers was nearly canceled after its first season, but the theme song, "Where Everybody Knows Your Name," was very popular. To satisfy viewer demand, the theme was made into a full song and released as a single.