Wouldn't it be awesome if we could craft musical instruments? With the Holiday festival about to kick off, it would be fun if music could be a part of it. I think that using a similar interface to chopping wood or mining could be used so we dont "Miss a beat"
Anyways, I know it's useless but would add a whole new dynamic to the social interaction.
An old MMO called Asheron's Call 2, you could get together with lots of people and play music...even though there different instruments, they all combined to make some pretty neat music.
What do you think?