Off subject: adding music

To venture off the path for a minute:  why don't more sites offer the ability to add music as background, as Classroom 2.0 does?  It's a fun variation that "hooks" many people like me!

Twitter needs to do that, too.

With Blogger, music can be added as a gadget using iLike.com, and I'm sure there are more add-ons out there to add music to blogs or wikis. . . hmmm, sounds like an assignment for music-library collaboration. . .  have to write some EQs for that!