Must Have Been Crazy

"Must Have Been Crazy"
Single by Chicago
from the album Chicago 13
B-side"Closer to You"
ReleasedAugust 1979 (1979-08)
Recorded1979
Length3:26
LabelColumbia
SongwriterDonnie Dacus
Producers
Chicago singles chronology
"Gone Long Gone"
(1979)
"Must Have Been Crazy"
(1979)
"Street Player"
(1979)

"Must Have Been Crazy" is a song by the American rock band Chicago. It was released in August 1979 as the lead single from their eleventh studio album, Chicago 13, and was written by Donnie Dacus, who performs lead vocals in the song. It peaked at No. 83 on the Billboard Hot 100.