Concerts by the Julliard Quartet are usually distinguished, but the prescence of pianist Nadia Reisenberg lent an uncommon luster to their program at the Library of Congress last night.

The years have in no way diminisher her art. She plays with the same consummate musicianship that made her famous. Her fingers seem every bit as nimble, and her enormous experience shines through everything she does.

In the Mendolssohn D Minor Trio, it was her complete control of the idiom that was so delicious. Violinist Earl Carylss and cellist Joel Krosnick were with her every inch of the way in spirit but could not quite match the smoothness of her legatos in the firt movement, or the lightness of her touch in the third. Reisenberg, on the other hand, had no trouble at all keeping up with their passion and power.

The Fauer C Minor Piano Quartet brought an ideal balance of forces. Here, Reisenberg's marvelous touches of piano ornamentation were a foil for the broad sentiments of the strings, and the contrast and interplay of the instruments produced a splendid performance.

The concert began with a rollicking account of the Beethoven Opus 18 No. 6 String Quartet. It was the Juilliard at its best, which is saying a great deal.