I made the playlist/play next list at the right of the screenshot. The functionality is inspired by youtube music – if the current song finishes, play the next one. If there isn’t a next one in this playlist, play the first from a “suggests” list and move it from the bottom list to the top one. This was really hard to do, because I wanted the url to update the song id without reloading the page, actually autoplaying the next song, etc. I also fixed some UI/layout issues.