With his new career as a bandleader thriving, Mr. Smith married Doretha Ford in 1957. They had five children before they divorced in the mid-1960s.

Mr. Smith and the Clowns reached the pop Top 10 in 1958 with the wry “Don’t You Just Know It.” The title was a phrase often used by the band’s bus driver, Rudy Ray Moore, who would go on to a career as a bawdy comedian and the star of the “Dolemite” movies.

That same year, Mr. Smith recorded “Sea Cruise.” Johnny Vincent, the owner of his label, Ace Records, was a partner in a distribution company, Record Sales Inc., with Johnny Caronna. The day after Mr. Smith recorded the music for “Sea Cruise,” planning to have the Clowns add vocals, Mr. Caronna claimed the song for a teenage singer he was managing, Frank Guzzo, professionally known as Frankie Ford.

According to Mr. Wirt’s biography, Mr. Smith was told, “Johnny Vincent agreed that if you can sell a million on this record, Frankie can sell 10 million” — and, he later recalled, “It hurt me to my heart when he told me he was taking that.”

Mr. Vincent, who died in 2000, also claimed co-writing credits on many songs Mr. Smith wrote and recorded for Ace, including his hits, although he later relinquished those credits. Mr. Smith moved to Imperial Records as the 1950s ended, but he returned to Ace to record a rollicking holiday album, “’Twas the Night Before Christmas,” on which he declaimed the title poem over a jaunty horn section.

With the British Invasion of the 1960s, guitar-driven rock supplanted piano-centered New Orleans R&B on the pop charts. Mr. Smith continued to record on the Pitter Pat and Instant labels through the late 1960s, under his own name and others, and he had some regional hits. He also wrote and produced songs for other performers, notably Skip Easterling, who had a hit across the South in 1970 with Mr. Smith’s funk reworking of the Muddy Waters standard “Hoochie Coochie Man.”