#!/bin/bash

MUSICDIR=/cygdrive/d/media/mp3
MUSICRE=".*\.(MP3|FLAC|OGG|M4A)$"
CHANCE=100

find $MUSICDIR -regextype posix-extended -iregex $MUSICRE | while read file; do
	if [ -r "$file" ] && (($RANDOM % $CHANCE == 0)); then
		echo $file
	fi
done | sort -R