Violinist Charles Treger and pianist Andre' Watts brought sumptuous music making to the Library of Congress last night. Including some of the choicest bits from the repertoire, the pair produced a feast rich enough to satisfy the most gluttonous of chamber music fans.

One can easily see why the two have made it a point to include a joint tour in their annual schedules ever since their first collaboration in a series of Schubert concerts in 1978. The underlying dynamic of each one's performance is charged with the same kind of fluid energy. It stems from their exceptional technical agility and intellectual quickness allied with a keen emotional responsiveness.

A special feature of their partnership is the vibrant clarity with which the music unfolds. They captured the mercurial force of Beethoven's G-Major Sonata, Op. 30, No. 3, in deft strokes, revealing with sure insight -- especially in the second movement -- the poignancy that underlies its graceful language. Their restraint and lucidity in handling Prokofiev's F-Minor Sonata, Op. 80, dramatically underlined the power of this sustained spiritual outcry. The second movement, in particular, was approached with a passionate perception that exposed its barely contained outrage.

For the antique classicism of Claude Debussy's Sonata they found a cool elegance and then with the closing Franck Sonata turned around and, appropriately, reveled in its flowing melodies and full harmonies.