 Prior to his acting career, he belonged to the R&B singing group The Three Riffs, which was active from the late 1940s and performed at upscale supper clubs in New York City.He was also a songwriter and had big hits with "Talk to Me" which was sung by Little Willie John, and "Break It to Me Gently," which was a smash hit twice, once by Brenda Lee in 1962 and once by Juice Newton in 1982.In the 1982 film, "The Verdict," Seneca plays the supporting role of Dr. Thompson, a small-town women's hospital physician brought in by attorney Frank Galvin (Paul Newman) to support his belief that two famous doctors' incompetence left his client alive but in a coma.