We had so many possibilities for last week’s three-minute mixtape, we had to create another playlist featuring classical music’s most famous dance tunes, all under three minutes (with one minor exception).

Can the modern piano evolve any further? Pianist and inventor Christopher Taylor thinks so, and has been laboring to perfect a two-keyboard instrument, performing with an early near-equivalent wherever he can.

You expect to see a folk singer with a battered guitar busking at a train station, but an operatic baritone? A quartet of cellos? Here’s what that’s about.