"xargs" is basically what you're thinking of as "map", and "find" is more powerful than simple globbing. find . -type f -name \*.mp3 -print0 | xargs -n 1 -

"xargs" is basically what you're thinking of as "map", and "find" is more powerful than simple globbing. find . -type f -name \*.mp3 -print0 | xargs -n 1 -0 some_command