Question: who sang one is the loneliest number original
Answer: `` One '' Single by Harry Nilsson from the album Aerial Ballet B - side `` Sister Marie '' Released 1968 Recorded 1967 Genre Chamber pop Label RCA Songwriter ( s ) Harry Nilsson Producer ( s ) Rick Jarrard Harry Nilsson singles chronology `` Good Old Desk '' ( 1967 ) `` One '' ( 1968 ) `` Everybody 's Talkin ' '' ( 1968 ) `` Good Old Desk '' ( 1967 ) `` One '' ( 1968 ) `` Everybody 's Talkin ' '' ( 1968 )