The following command will find all files with the extension *.mp3 that are 7 days old or older, it will then delete them.
find /home/music/ -name "*.mp3" -mtime +7 -exec rm {} \;
Change the -mtime to set how how old the files are that you want the action to apply to.
After -exec, you can put any command you like, such as remove, rename, compress etc.
