"Ain't No Mountain High Enough" was a very popular recording for soul music legends Marvin Gaye and Tammi Terrell when it was originally released in 1967. It was turned into a hit once again three years later in 1970 when fellow soul music legend Diana Ross re-recorded it and turned into a Grammy-nominated #1 pop single for Ross as a solo artist.

Originally, when it was initially released by Gaye and Terrell, it was the first recording by the famed duo. According to Gaye and the song's producers Ashford & Simpson, Terrell was a little nervous and intimidated of recording because she hadn't rehearsed the lyrics to the song and during her first verse, she looked at the lyrics as she sung "no matter where you are" but then got comfortable thanks to Gaye's lead. The song peaked at #19 on the Billboard pop charts and went as high as #3 on the R&B charts. The original version was a care-free, danceable, and romantic love song.

Three years later, things had changed: Terrell was dead due to a brain tumor, Gaye was going through a change in his life that happened around the same time of Terrell's death, and now Diana Ross had left The Supremes to begin her solo career. After the initial ho-hum success of her first single, "Reach Out and Touch (Somebody's Hand)", Ross recorded the remake to "Enough" as part-spoken word as she soulfully cooed and hummed throughout the song with The Andantes, Jimmy Beavers and Ashford & Simpson in the background singing along.

Ross' version was a very dramatic six-minute opus and is considered to be Ross' most notable song outside of "Love Hangover" and "Upside Down".It rose up to #1 on both the pop and R&B singles chart and got Ross nominated for a Grammy for Best Female Pop Vocal Performance.

In 1994, at the end of the movie Sister Act 2: Back in the Habit, Whoopi Goldberg and most of the cast of the movie, including future hip-hop/soul superstar Lauryn Hill, sung most of Gaye & Terrell's version and sung the Ross version near the end of the song mixing the two songs together.

The Gaye/Terrell version was inducted into the Grammy Hall of Fame in 1999.