The curtain rises in one hour, and the orchestra pit of the opera house is a muddle of stands, chairs and cards. Every player has to sit next to a partner with the same instrument, but the seating cards have been dealt face down. Pixel Mozart, baton tucked under one arm, takes charge of the reshuffle the musicians have nicknamed Tempo Twins.
He cannot help keeping time while he works. The rehearsal music plays on, a little light blinks with every beat, and a pair turned exactly on the beat earns double. Pairs off the beat still count, just less. Every finished section brings a bigger one to seat, and when the clock runs out the curtain goes up. How many sections can pixel Mozart seat in time?
