this is actually pretty easy. there are a lot of sites that offer free playlists. Such as Playlist.com | Listen to Free Music Online - Free Music Streaming - Search music, find music, listen to music, & share music online
, Welcome to musicddownloads.us - Search Results for "musicddownloads.us"
, and many more.
(I prefer playlist.com)
Once you've signed up and created a playlist (dont forget to save it if needed! haha), get the embeded code. Not all site have size choices, or autoplay choices, but you can fix that in the code yourself.
To make the playist a reasonable size, and still viewable and able to be turned off, play around with the sizes in the code to fix a good size that lets all of the play/pause , forward/backward buttons veiwable and useable! (: