Sam Moore, the tenor half of the scorching soul duo Sam & Dave — known for indelible hits like “Soul Man,” “Hold On, I’m Comin’” and “I Thank You” — died on Friday. He was 89.

His death, after surgery at a hospital in Coral Gables, Fla., was confirmed by his wife and longtime manager, Joyce Moore. The exact cause was unclear, she said.

At their peak in the 1960s, Sam & Dave churned out rhythm-and-blues hits with a regularity rivaled by few other performers. When “Soul Man” topped the R&B charts and crossed over to No. 2 on the pop charts in 1967 (it also won a Grammy), its success helped open doors for other Black acts to connect with white audiences.

Sam & Dave’s live shows were so kinetic — they were known as the Sultans of Sweat and Double Dynamite — that even as charismatic a performer as Otis Redding was hesitant to be on the bill with them, for fear of being upstaged. Mr. Moore once spoke of his need to “liquefy” the audience before he considered a show a success.

“The strength of Sam & Dave,” he said, “was that we would do anything to please the audience.”