First recorded by Kelly Gordon (1969).
Hit versions by The Hollies (US #7/UK #3 1969), Neil Diamond (US #20/MOR #4 1970), The Justice Collective (UK #1 2012).
From the wiki: “‘He Ain’t Heavy, He’s My Brother’ is a popular music ballad written by Bobby Scott and Bob Russell. Originally recorded by Kelly Gordon (who would later become a producer for Glen Campbell, Aretha Franklin, David Lee Roth) in 1969, the song became a worldwide hit for The Hollies later that year and again for Neil Diamond in 1970. Scott and Russell had been introduced to each other by Johnny Mercer, at a California nightclub. Although Russell was dying of lymphoma and the pair met in person only three times, they managed to collaborate on the song.