As a Prime member I was happy when I got the email for it
Pandora has been fine for it and to a lesser extent YouTube (because of having to have the screen on). Prime music is at least easier than Pandora to find just the songs you want.
We have yet to do the HDDR but did a dinner show at Disneyland in 2013 that seems very similar from what I can tell. Is the Disneyland show indeed similar to HDDR?
Am I reading right? This sounds a like it may have some "alien" customers throughout?
Get ready to listen to some unique music, taste the best drinks in the galaxy, and surround yourself with a colorful cast of characters. You never know what will happen at the cantina!