Custom tags/ratings/tag songs and then create dynamic playlists

I have three ideas I’d like to propose:

1. Custom user tags for songs/albums/etc. The idea is to add an option to add your own tags to a song, say “catchy”, or “sad, slow-paced” or whatever, that will show up next to the songs in your playlist or wherever you have it. This would be incredibly useful for finding specific types of songs quickly, if you don’t want to take the time to remember the song/album name and search through the whole playlist. Ideally colors would be supported as well, so if you’re in the mood for a “sad” sounding song, you just scroll through your playlist, check every song with a blue tag saying “sad” next to it, and add it to your queue. You could also sort your playlists by tags. As an aside, it would also be helpful to add your own ratings to songs, and sort by that. This would work similarly to tags.
2. Cross-playlist shuffle. This is already technically possibly by clicking on a playlist and doing “add to queue” or “listen next”, but from what I can tell the only way to do this is to hit “add to queue” or “play next" on whatever playlists you want to listen to, and hit the shuffle button twice. However, it’s still going to include whatever songs were in your queue. So this feature would let you listen to a random shuffling from only whatever playlists you choose to play from. The ability to clear the queue and “reshuffle” instead of having to turn shuffle off/back on would be extremely helpful as well. (The fact that you can’t clear the queue is odd and very annoying).
3. Custom Lyrics. I don’t expect this feature to get added because it would involve adding a whole new dynamic to the app, but I thought I’d share my idea anyways. There are many songs that don’t have lyrics in the app with them, and it would be amazing if there was a way to add your own lyrics to songs, and time the lyrics to pop up at the appropriate points in the song as well. This would be especially helpful for user-imported MP3 files. Possibly you could export/share your custom lyrics with other lyrics, but this feature isn’t as important. 

These are just some of my ideas, the first two of which I think are quite feasible and would greatly help the user experience. If you like these ideas, please give this post a vote.

P.S. (Where is the “my FLACs” import feature already)?

P.P.S (Please let us show playlists on the side of the app and let us drag songs into them like in Spotify).

   It would be great if we could add our own custom tags and ratings to songs/albums/etc. It would ideally support colored tags. There should be an option in each playlist that lists each tag used in said playlist. You would then be able to add all songs of that tag from that playlist to their own queue. So for instance, if you want to listen to only the “sad” songs in a playlist or in your favorites, you’d look at the tag selector and click on the blue “sad” tag, then > add all to queue. 

You could also use this to mark “listen later” for songs that, for instance, a friend recommends but you don’t feel like listening to right now. 

As an extension to this suggestion, you should be able to add custom user ratings to songs/albums. This would very similar to tags, and it would show the star or number rating next to the songs that you’ve rated. You could then organize your playlist by ratings and create a unique queue.