"That'll Be the Day" is a song written by Buddy Holly and Jerry Allison. It was first recorded by Buddy Holly and the Three Tunes in 1956 and was re-recorded in 1957 by Holly and his new band, the Crickets. Buddy Holly and the Three Tunes' version was released several months after the Crickets' version, which achieved widespread success. Holly's producer, Norman Petty, was credited as a co-writer, although he did not contribute to the composition.
Many other versions have been recorded.