These U-M early music professors perform a program of keyboard works by Scarlatti, Marcello, Vivaldi, and others on a recently acquired copy of a 1722 fortepiano by Bartolomeo Cristofori, widely regarded as the inventor of the piano. Also tomorrow at 2 p.m., renowned keyboard builders Thomas and Barbara Wolf present a guest lecture on how they built the instrument, followed at 4 p.m. by a student keyboard recital. 8 p.m., U-M Moore Bldg., McIntosh Theatre, 1100 Baits. Free. (734) 764–0583.