How to remove a song from Google Play Music without removing it from the storage? I recently added a couple of ringtones and notification sounds to my phone by placing them into my storage's Ringtone and Notification directories respectively, and I can select them from the sound settings dialogs without any problem. 

The thing is that they also appear as songs on my Google Play Music's playlists, and of course I don't want to hear a 1 second long "jigglypuff!" notification sound every now and then when I'm listening to my music on shuffle. 

I did search using Google for a while but it seems that there's no way of either removing the file from just the music database or from excluding those directories from the media search. I recall this didn't happen on an old 4.0 Sony Xperia phone I had with it's music player.
Hello everyone and thank you for your answers, I've finally managed to accomplish this with a very simple solution: The Android media storage service will not index media files inside directories which are hidden (preceded by a "."), but also those which contain a file named ".nomedia", so I just created on all the directories I wanted to exclude and that was it. Hope it helps somebody else. 

P.S.

I didn't want to hide the entire directories since they're my phones ringtones and notifications directories and I still want them to be visible to the sound manager to use them, I just don't want them to be seen by Google Play Music.

I found the solution here: http://www.guidingtech.com/15563/hide-certain-files-android-music-player-photo-gallery/