Co-written and first recorded by Dennis Lambert (1972).
Hit versions by The Righteous Brothers (US #32 1974), The Oak Ridge Boys (C&W #1 1980).
From the wiki: “‘Dream On’ was written by Dennis Lambert and Brian Potter, and is best-known for the cover recorded by The Oak Ridge Boys in 1980. Lambert first recorded the song in 1972; The Righteous Brothers covered the song two years later for their final Top 40 appearance in the Billboard Hot 100 (except for the 1990 re-issues of ‘Unchained Melody’ and ‘You’ve Lost That Lovin’ Feeling’). ‘Dream On’ is the only Oak Ridge Boys single to feature bass singer Richard Sterban on lead vocals.”
The Righteous Brothers, “Dream On” (1974):
The Oak Ridge Boys, “Dream On” (1980):