First recorded by Jo Jo Wail & the Somethings (1963).
Hit version by Stevie Wonder (US #29/R&B #5 1964).
From the wiki: “‘Hey Harmonica Man’ was written by Marty Cooper and Lou Josie, and was first recorded in 1963 by Jo Jo Wail & the Somethings. It would be covered by Stevie Wonder in 1964.
“Wonder has poured scorn on his pre-’65 Motown output; whenever he’s asked about these records, he seems to lump them all together as a collection of ‘juvenilia’. Perhaps surprisingly, it’s ‘Hey Harmonica Man’ for which he reserves particular criticism, describing it on more than one occasion as ’embarrassing’.