Mentioned in passing popular artist from the 1986 science fiction novel Wizard by John Varley. The novel is set in the not-too-distant future.
"Who, in your opinion, is the greatest musician of the past or present?"
Chris'fer was getting angry. Privately he thought Rea Pashkorian must be the best; he had all her tapes.
"John Philip Sousa."
She grinned without looking up, and he could not understand it.