Hey there!
You could fork my music player (downloads from youtube via an id, song name, artist etc as mp3 and play them on your raspberry Pi) and add a playlist feature or wait for me to code it (should be done soon)

https://github.com/mac-ak47/PiTube

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Hi! I would like to present the project I'm currently working on for the Raspeberry Pi. The app allows you to download and listen to musics from youtube via an API I created myself wiht nodejs. You can play songs per id, artist name, song name, album etc The app's still in beta but works quite well ...