Spellsinger by Alan Dean Foster

In a world where magic and music intertwine, a young law student from Earth named Jon-Tom is unexpectedly transported to a fantastical realm filled with anthropomorphic animals and mystical creatures. Guided by the eccentric turtle wizard, Clothahump, Jon-Tom discovers that his unique ability to cast spells through music could be the key to saving this magical land from impending doom. As he embarks on a perilous journey, he encounters a motley crew of allies, each with their own quirks and talents, and learns to harness his newfound powers in a race against time to thwart the dark forces threatening their world.

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