Marvin L. Sims was an American soul singer active during the 1960s and 1970s. His style was deeply rooted in the traditional rhythm and blues, often delivering emotionally charged performances that echoed the sentimentality of the era's soul music. Sims' signature sound was marked by his smooth, emotive vocals and the prominent use of brass and rhythm instruments. His most notable work, "Get Off My Back," is often recognized for its social commentary, cementing his significance in the annals of soul and R&B music history.