A kid with fast hands [vid]

Some game that’s like “DanceDanceRevolution” only with notes you bang on like Whack-A-Mole.

Pop’nMusic, actually. [Wiki][Official site]
It’s not a new arcade game — just one that you’re probably not familiar with.

Check the speed which this kid smacks the keys.

Sound req’d, but only for the classical song name I know but can’t place the name of about 40 seconds in.
I think it’s Mozart’s Piano Sonata No. 11
The video is about three years old.