Purchased Gyruss today, the music is intact!
Also, when you boot up Game Room there is a software update that makes a number of changes/additions:
* In the main menu, it tells you what game packs the games are from in the preview videos.
* There is now an in-game leaderboard that tells you your current overall rank in that game on the left upperhand corner, and it also shows you a dynamic leaderboard on the right that shows your standing depending on the score you have in the game you are playing. Very cool addition, with animations etc.
* The Atari 2600 interface has changed in Classic Mode.
* They added a new avatar animation for when you play a game. It appears that now another avatar will come over and cheer you on as you play something.
* New game filters were added. You can filter by Game Pack.
* You now get fireworks with a leaderboard score and the option to send a taunt message when you beat your friend's high score on the machine.
* There is a new pirate theme
Clearly Game Room has not been forgotten by MS.