"I'm Sorry" is a R&B/Soul song by the American vocal group The Delfonics, released in April 1968.
The song was the Delfonics' second chart single and the follow-up to their smash hit "La-La (Means I Love You)", which went to number 4 on the Billboard Hot 100; "I'm Sorry" was quite reminiscent of their earlier hit, complete with similar-sounding "la la las".
[1] "I'm Sorry", and several other soul tunes, were unintentionally included in the background of Jim Jones' infamous Death tape, an audio recording made during the Jonestown Massacre of November 18, 1978.
[2] The music (which sounds muffled and played at off-speed, resembling a church organ in spots) was originally recorded onto the source tape, then recorded over by Jones, resulting in a "ghost recording".
"I'm Sorry" can be heard at the very end of the tape after Jones stops talking, played at half-speed.