Wiifanboy.com has revealed that Wii Music sold 50,000 copies day one and put up a chart comparing it to other notable Wii titles from Nintendo.  The list as follows:

Super Mario Galaxy: 130,000 on day one*
Super Smash Bros. Brawl: 500,000 on day one *
Wii Fit: 254,000 in first two days
Mario Kart Wii: 594,000 in first four days
Wii Sports: 176,167 in first two days
Wii Play: 175,297 in first two days
The Legend of Zelda: Twilight Princess: 139,011 in first two days
Wario: Smooth Moves: 63,954 in first two days
Wii Music: 50,000 on day one

Not a bad start but doesn't look like it will trouble Wii Fit anytime soon! Will it have legs? 

The link is http://www.nintendowiifanboy.com/2008/10/17/wii-music-shifts-50k-on-day-one-in-japan/

Remember, the Japanese economy was in much better condition at the time of every single one of those other releases.

Cool, but this will at least sell like 3 million copies.

Not bad

The Japanese should be embarassed.

Brain Age's first week sales in Japan was 46,590 ...

Day one and week one sales are only really good predictors of lifetime sales on highy hyped conventional videogames.

Wow... wii music bombed! Or at least sold well below what nintendo expected as it only sold about 15% of it's stock. At least there will be stock available during the holiday season!

If anyone starts saying this game bombed, they have not being paying the slightest attention to the last 3 or 4 years in gaming.

brain age was suppose to make you smarter.

Jo21, that may have been the message some false advertising implied but in actuality it was a ton of really fun minigames that dealt with language, math, spatial skills, etc. Very fun game.