1. I Will Always Love You: Originally recorded by Dolly Parton in 1974, this song became a massive hit when it was covered by Whitney Houston for the 1992 film "The Bodyguard."
2. Yesterday: The Beatles' iconic 1965 ballad was later covered by several artists, including Boyz II Men, who took the song to number one in 1997.
3. What a Wonderful World: First recorded by Louis Armstrong in 1967, this classic has been covered by numerous artists, including Israel Kamakawiwoʻole, whose rendition reached number one on the UK charts in 2007.
4. Unchained Melody: The original 1955 recording by Les Baxter reached number one, but the song gained even more popularity when it was covered by The Righteous Brothers in 1965 and again when Robson & Jerome released their version in 1995, both of which topped the charts.
5. My Heart Will Go On: Originally recorded by Celine Dion for the 1997 movie "Titanic," this power ballad became a global sensation and reached number one in numerous countries. It was later covered by artists like Il Divo, Westlife, and Sarah Brightman, among others.
6. All of Me: John Legend's 2013 hit single was later covered by various artists, including Glee Cast, whose rendition reached number one on the Billboard Hot 100 chart.
7. The Twist: Chubby Checker's classic dance song from 1960 was later covered by numerous artists, including Gary U.S. Bonds and Sam Cooke, both of whose versions topped the charts.
8. Hallelujah: Originally written by Leonard Cohen in 1984, this song gained massive popularity when it was covered by Jeff Buckley in 1994. It later reached number one in several countries when it was featured in the 2001 animated film "Shrek."