Originally recorded by Wayne Carson Thompson (1969).
Hit version by The Box Tops (US #18/UK #22/CAN #9/AUS #7 1969), Eddy Arnold (MOR #22/CAN #44 1970).
Also recorded by Gin Blossoms (1994).
From the wiki: “Wayne Carson Thompson performed professionally as ‘Wayne Carson’, and was a Nashville-based musician, producer and songwriter when he wrote and first recorded ‘Soul Deep’ in 1969. Among his other songwriting credits are ‘The Letter’ (also recorded by The Box Tops), ‘Always On My Mind‘, and ‘She’s Actin’ Single (I’m Drinkin’ Double)’.
“Covered by the Box Tops in 1969, ‘Soul Deep’ was the third of three singles released from the album Dimensions.”