Joseph Haydn composed twenty-one string trios for two violins and violoncello, of which three have been lost. These chamber music gems, which do not turn up very often on concert programs, are full of surprises and provide much playing enjoyment. Based on the Haydn Complete Edition, also published by G. Henle, Haydn's eighteen surviving string trios are presented in two practical volumes. The second contains Trios Hob. V:15-21. The Critical Report provides valuable information about the trios' genesis and sources.