This year, Randolph’s Central Vermont Chamber Music Festival did something unusual. It invited an established ensemble to join its annual program. And a fine ensemble it was, the Maryland-based Dalí Quartet, which specializes in Latin American music.

On Sunday at Woodstock Town Hall, the Dalí Quartet was joined by cellist Peter Sanders, the festival’s artistic director, in a diverse and truly satisfying program, a repeat of Saturday’s at Chandler Center for the Arts in Randolph.

For these concerts, Dalí Quartet violist Adriana Linares was replaced by Jaime Amador, regular violist with the Harlem String Quartet.

The major work was certainly Franz Schubert’s String Quinter in C Major, D. 956, often called the “cello quintet” for the additional cello. Sanders joined the Dalí for this intense and beautiful performance of one of the supreme masterpieces of the chamber music literature.

Violinist Ari Isaacman-Beck led the performance as was the style of before the end of the 19th century. He is a virtuoso who plays with an ease that allows him plenty of nuance. That said, his playing was a bit reserved for his part.

That’s not to say that the others didn’t have major roles. Second violinist Carlos Rubio has a natural warmth and sense of nuance. Cellist Jesús plays with a natural extroverted expressiveness., matched by guest violist Amador. Sanders rounded out the quintet with his solid, but nuanced and expressive performance.

The opening of the quintet seemed a bit raucous but quickly soothed out. They also employed more rubato than is usual, but it worked. The slow movement, Adagio, was intimate and exquisite.

Another major masterpiece, Ludwig van Beethoven’s String Quartet in B-flat Major, Op. 18, No. 6, the last of the so-called “Early Quartets,” opened the program. Here again, the playing was expert, and Isaacman-Beck was a bit reserved. Still, the earthiness of the young Beethoven dominated. In fact, it was an exciting performance.

Isaacman-Beck certainly didn’t hold back in Juan Ramírez’s “Suite Latina,” in which the first violin has an overtly virtuosic part. This three-movement confection, more entertainment music than the other two works, is a brilliant Hispanic extravaganza with hints of Piazzola. (The Mexican-born Ramírez is a violinist in the Atlanta Symphony Orchestra.) The performance simply delicious.