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You need a semicolon or a newline in front of the 'do'
Simpler:find . ! -iname '*.mp3' -type f | wc -l

I would have used tr instead of sed:
mv $a "$(echo $a | tr _ ' ')"

you should quota the second parameter of mv,you see,if you have a file named "name with blanks",the shell will expand the blanks within variables without double quotas or single quotas or backslash....