An Anime Character Orchestra

[Rosencrantz]

Hmm, as I recall Shinji from Evanagelion played the Violin

 

[Animefreak17]

Asuna plays the morakus
Nodoka plays the drum

And two others from negima season 2 in the credits

 

[Random]

Yin from Darker Than Black plays piano.
Sayuri and Hiroki from The Place Promised ... both play violin.

 

[Ian Wolf]

Sorry for reviving, but if I remember rightly I think Italy in Hetalia plays the lute.