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Use inverted conditions with the find command

find . -type f -not -name '*.mp3'

November 23, 2020sandreas

Explanation

Find is normally used to positively match a pattern, for example this finds all regular files (-type f) whose name ends with ".mp3" (-name '*.mp3'):

find . -type f -name '*.mp3'

If you want to use a condition in the inverted sense, for example to find files whose name does not end with ".mp3", then you can invert the condition by using -not predicate in front of it, as in the main one-liner above.