Pro Musica Rara presents the music of Boccherini, Haydn, Ignaz Pleyel, and Luigi Tommasini -- the Friends and Rivals of the title. Performing are returning guest artist Kenneth Slowick on fortepiano and baryton (an early viol-like instrument); and PMR core musicians Cynthia Roberts on violin, and artistic director Allan Whear on cello. There is a free, pre-concert lecture at 2:30, and a free, meet-the-musicians reception afterward.