"What a Fool Believes" is a song written by Michael McDonald and Kenny Loggins. The best-known version was recorded by the Doobie Brothers (with McDonald singing lead vocals) for their 1978 album Minute by Minute.
Debuting at number 73 on January 20, 1979, the single reached number one on the Billboard Hot 100 on April 14, 1979, for one week. The song received Grammy Awards in 1980 for both Song of the Year and Record of the Year.
The song was one of the few non-disco No. 1 hits on the Billboard Hot 100 during the first eight months of 1979. The lyrics tell a story of a man who is reunited with an old love interest and attempts to rekindle a romantic relationship with her before discovering that one never really existed.
Apparently as a joke, Michael Jackson claimed in a videotaped phone conversation with Elizabeth Taylor in 2003 that he contributed at least one backing track to the original Doobie Brothers recording, but was not credited for having done so. Entertainment Tonight broadcast this claim and apparently people did not realize that Jackson was joking. As a result, the band later denied his participation.