This song was written and recorded by Donovan in 1966. The recording features vocals by Paul McCartney during the instrumental break of the song. The song was produced by Mickie Most and was released as a single in America in 1966. The B-side was Sunny South Kensington. It went to number two on the Billboard chart. Mellow Yellow was released as a single in the UK in 1967. The B-side was Preachin’ Love. It went to number eight on the UK Singles chart.