Who's on Stage?

Skippy, what's the name of that group playing on stage?

Source: This one is from Animaniacs. This would be the Slappy and Skippy bit where they do a "Who's on First?" bit at Woodstock. Classic.



Or, if you prefer to hear Skippy say "quien" a hundred times, you can see the Spanish version starting at 5:10 in the following clip: