With Audio Player you can create playlists from youtube, soundcloud or online radios links. Or just copy your youtube playlists.
Add your songs or playlists by pressing <b>Ctrl+Shit+L</b> while on the soundcloud, youtube or web radio page that you like, or by copying the page's url and pasting it in the bottom "add" menu
Of course, all of your settings and playlists are synced between all of your chrome sessions on multiple devices, as long as you are logged in.
You can also give it an youtube playlist url and it will add up to 200 videos from that playlist.
Every song/video keeps a link to the original, so you can open the original website, whenever you want.
I plan on adding the following functionalities:
Playlist edit by dragging and dropping songs
Playing local files
Better handling at online streaming radios
All other ideas and suggestions are welcome :)