Noncommittal Google Music users take note — the service is adding a Trash page that lets you undelete songs up to 28 days after you junk them. To get to the page just click "options" in the top right corner of the web player and choose "music trash" from the menu. From here you can also choose to permanently delete the cruft from your collection, although doing so also gets rid of all the associated data like your play counts. You want to be careful, though — if you permanently delete a song you purchased from Google Play the only way to get it back is to buy it again. It looks like Google isn't joking when it says "permanently."