There are innumerable fantasy books which fit your description. A very good series is the "Spellsong" series by L.E. Modesitt Jr., the first book of which is "The Soprano Sorceress". You might also consider Rick Cook's "WizBiz" series in which a computer programmer is summoned to a fantasy world, in which he find that his programming skills make him a powerful wizard (excellent series!).
Then of course there's the absolutely classic "Barsoom" series by Edgar Rice Burroughs.
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