Classical music

Tonight, violinist Gidon Kremer appears at the New Hampshire Music Festival in Plymouth . . . and Leonard Slatkin leads the Boston Symphony Orchestra in music of Mahler and John Harbison at Tanglewood. . . . Tomorrow, the Monadnock Music Festival charts the "Birth of the Modern" at the Peterborough Town House in New Hampshire . . . the Keller Quartet appears at the Norfolk Chamber Music Festival in Connecticut . . . the Berkshire Chorale Festival presents Orff's "Carmina Burana" in Sheffield . . . and violinist Midori appears with the BSO at Tanglewood. . . . Sunday at Tanglewood, pianist Garrick Ohlsson is the BSO's soloist . . . and the Festival of Contemporary Music begins its five-day Elliott Carter extravaganza. - Jeremy Eichler