Meghan Trainor discusses "the one song" she regrets "throwing away."

 Meghan Trainor recently revealed the 'one song' she has ever regretted giving away to the girl group Fifth Harmony.

Sledgehammer is the song in question, and it was presented to the former girl group a few years ago.

In a recent interview with PopCrush, the Made You Look singer, 29, revealed, "'Sledgehammer' by Fifth Harmony is such a terrific one."

For those who are unfamiliar, the song is the second single from the group's first album Reflection and has charted many times on the Billboard Hot 100.

The song's virality isn't the only reason Trainor likes it; it also has sentimental meaning, according to reports.

This was the song that "truly impressed" her husband, actor Daryl Sabara, and convinced Trainor that he was her soulmate.