Select multiple songs to add to a playlist

[Pingk]

Currently, to add songs to an established playlist, you need to select each song individually and add it to said playlist.
It would be a lot less time consuming to be able to highlight multiple songs, and then batch add that group to the playlist.

I notice this would be a substantial change from the current system, where a long-press currently brings up a menu, rather than simply highlighting the song. However the existing functionality would remain since the 3 menu dots to the side of each song doesn't have to be changed.