"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. Bowing at #73 on 20 January 1979, the single reached number one on the Billboard Hot 100 on 14 April 1979 for one week. The song received Grammy Awards in 1980 for both Song of the Year and Record of the Year."What a Fool Believes" was one of the few non-disco No.