The Cambridge Collegium Musicum's final performance last Monday night was in many ways the least enjoyable of its three-concert series. The music frequently sank to triviality, and the group's playing lacked the enthusiasm that had characterized its first two concerts.

Devoted to unfamiliar music of the late Eighteenth Century, the evening was chiefly of historical importance. One cannot help admiring Mozart and Haydn more than ever, after comparing them with their mediocre contemporaries represented on Monday's program.

The opening Concerto by Johann Pfeiffer typified the entire program. Written for piano, cello, and two violins, this work has no high spots, low spots, or anything else to make it at all memorable. The Collegium's performance was unusual because of the piano it used--an authentic instrument made by Andreas Stein in 1790. Its tone midway between a harpsichord and a modern piano, was subdued and refined--well suited to the music. Erwin Bodky played smothly and sympathetically, much better than he had done on the harpsichord in weeks past.

Two of New England's best cellists, Samuel and Joseph Zimbler appeared together in Boccherini's C major Quintet. Once again, the music was routine; the cleverly-scored last movement was the only part that showed marks of inspiration. The ensemble sounded best in this work: the instruments blended well together, except for Wolfe Wolfinsohn's violin. Wolfinsohn, after playing extremely well for the first two concerts, finally had a bad night. His tone was squeeky, and he did little more than hit the right notes.

J. C. Bach's Quintet in E flat for flute, oboe, violin, viola, and continuo concluded the program. The combination of woodwinds and strings resulted in some unique tonal effects, but the work itself seemed not worth the trouble.

Despite the dubious quality of the music it presented, the group deserves high praise for playing obscure works which would otherwise never be heard. Its determination to preserve authenticity is an interesting experiment, and, judging from the large audiences it drew, a successful one.