Your search for "soul / r" revealed the following:

JACK DUPREE [Me & My Mule / Failing Health Blues]

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ID No. 231866 Label KING (US) Production US Genre Soul/R&B / Male Vocal Condition EX- Soundclip* 1956 US Rhythm & Blues

MARVIN & JOHNNY [Yak - Yak / Pretty Eyes]

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ID No. 231876 Label ALLADIN (US) Production US Genre Soul/R&B / Male Vocal Condition EX Soundclip*1955 US Rhythm & Blues

MONTE EASTER [What's The Use / I Was Mad]

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ID No. 237145 Label IMPERIAL (US) Production US Genre Soul/R&B / Male Vocal Condition EX- Soundclip* 1951 US Jump Blues.