The trio of Lynn Chang, Richard Kogan, and Yo-Yo Ma has been the top chamber group at Harvard for two years. On Friday night, they will have a chance to show off individual skills as each will tackle a difficult concerto assisted by Gerald Moshell's St. Lowell-in-the-Fields Orchestra.

On Saturday, F. John Adams and the Collegium Musicum will perform Bach's B-Minor Mass, perhaps the greatest mass ever written (sorry Missa Solemnis fans).

Friday:

Tchalkovsky's Variations on a Rococo Theme, Schubert's Wanderer Fantasy as orchestrated by Liszt, and the Brahms Violin Concerto; Yo-Yo Ma, cello, Richard Kogan, piano, Lynn Chang, violin. The St. Lowell-in-the-Fields Orchestra, Gerald Moshell, conductor; Lowell House Dining Hall; two performances: 8:30 and 11:15 p.m.

Works of Franck, Wieniawski, and Bach; Cecylia Arzewski, violin, and Jay Gottlieb, piano; Currier SCR; 8:30 p.m.

Bach Partitas; Daniel Hathaway, harpsichord; Eliot Library; 8:30 p.m.

Works of Debussy and Ravel; George Loring, plano; Dunster Library; 5:30 p.m.

Saturday:

Bach's Mass in B-Minor; Harvard Radcliffe Collegium Musicum, F. John Adams, conductor, Sanders, 8:30 p.m.

Ragtime Harpsichord, Don Angle Eliot Library, 8:30 p.m.

Stravinsky's L'Histoire du Soldat; Jay Gottlieb, piano, Ronan Lefkowitz, violin, and David Kass, clarinet; Currier Fish-bow 8 p.m.

Works of purcell, Boismortier, and Telemann: John Tyson, recorder, Carole Epple, flute, and David Schulenberg, harpsichord; Dunster Library; 5:30 p.m.

Sunday:

Works of Haydn, Britten, Boccherinl, and Wallstein; Janet Boorky, flute, Ellen Bridger and Bryan Epperson, cellos, Margaret Toohey, clarinet, Terry Wallstein, piano, and Betsy Horse, harp; Dunster Library; 3 p.m.

Monday:

Works of Bach, Schubert, Bartok, and Chopin; Charles Fisk, piano; Quincy Dining Room; 8 p.m.

Tuesday:

Songs of church, spring, war, and love; I Dilletantl Nuovi; for the benefit of the Timothy Charles Faron Memorial Funds; Adams JCR; 8:30 p.m.