"Reason to Believe" is a song written, composed, and first recorded by American folk singer Tim Hardin in 1965.

On television, the duo performed their version on The 5th Dimension Travelling Sunshine Show on August 18, 1971[4] and Make Your Own Kind of Music on September 7, 1971.

British singer and songwriter Rod Stewart's version of "Reason to Believe" appeared as the first single from his 1971 album, Every Picture Tells a Story, with "Maggie May" as the B-side.

Stewart's double-sided hit, which topped the Hot 100 during all five chart weeks of October 1971, held the Carpenters' "Superstar" at No.

There is a 2 second pause, before Stewart's vocal is heard singing the bridge in a cappella, ("Someone like you"), before the piano enters, followed by the violin, the drums and the guitar, featuring a rhythm change from 2/4 to 3/4 for a few measures, before reverting back to the 2/4 rhythm, with Stewart repeating the bridge before he stops singing, with the instruments carrying on the melody to through the song's fade.