Considering that Mozart's Divertimento in E-flat is far and away the greatest string trio ever written, and one of the unquestionable monuments of chamber music generally, it doesn't get the attention that it surely deserves from either record labels or collectors. Perhaps the dearth of regularly constituted string trios (as opposed to quartets) has something to do with it, but the fact remains that there is no greater testament to Mozart's genius than this epic, nearly 50-minute-long masterpiece in six movements that contains not a second that fails to rise to the highest level of textural gorgeousness and supreme melodic inspiration. Happily, most performances understand how special the music is, and give it their best effort. This one is no exception. The Zimmerman Trio plays with remarkably accurate intonation and a ravishing tone that's also mindful of the Classical style. Schubert's single-movement trio makes the perfect coupling. It seems to grow right out of the Mozart until the end of the exposition, when Schubert suddenly sails in with some typically arresting harmony.

Beethoven's trios for violin, viola, and cello remain among his least-played works. They seem to point back to the occasional chamber music of the Classical period, and if they're not given the proper attention, that's exactly what they do. But Beethoven himself thought enough even of the very early String Trio in E flat major, Op. 3 (1794), to supervise a keyboard arrangement of the work in the 1810s, and the Op. 9 set heard here, composed in 1798, is almost as ambitious as the group of Op. 18 string quartets that followed it by about a year, and for which it can be seen as a kind of study. The hard, weighty performances by the Trio Zimmermann command attention for these works. Hear the way it sculpts out the jagged opening melodic material of the climactic String Trio in C minor, Op. 9/3, or lay into the quasi-orchestral finale of the first trio of the set. There's a good deal of motivic work here that forecasts the density of Beethoven's mature chamber music language.

For close to 300 years Bach’s Goldberg Variations have awed performers as well as listeners, through an unparalleled combination of a dazzling variety of expression and breath-taking virtuosity with stupendous polyphonic mastery. No wonder then that other musicians than harpsichordists have wanted to make it their own – pianists, first and foremost, but also accordion players and guitarists, flautists and harpists.