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Spellsinger by Alan Dean Foster.
It's about a guy who is transported into a fantasy world and he discovers he can make magic by playing (rock) music.
The first few books (it's a series) are quite good, then it sort of fell apart, but still, kind of a classic.
And although not exactly famous, Mick Farren was a musician and has written several novels, including Jim Morrison's Adventures in the Afterlife which I thought was quite good.
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