TANGLEWOOD Ozawa Hall hosts visits this week from Chanticleer (Wednesday) and the Danish String Quartet (Thursday). In the Shed, Andris Nelsons will be making his first Tanglewood appearances of the summer, leading works by Mozart and Mahler (Friday) and Sibelius and Beethoven (Saturday). On Sunday he leads the Tanglewood Music Center Orchestra in an all-Brahms program. Look out too, for Friday’s Ozawa Hall Prelude Concert at 6 p.m., which will include Schubert’s F-Minor Fantasia for piano four-hands with Paul Lewis and Jonathan Biss, two pianists whose interpretive styles share a clear elective affinity. Lenox, 617-266-1200, www.tanglewood.org

BANG ON A CAN MARATHON Every summer the new-music collaborative takes up residence at MASS MoCA, and caps its visit with a high-energy six-hour marathon concert. This year’s lineup includes works by John Luther Adams, Steve Reich, Louis Andriessen, Julia Wolfe, George Crumb, Missy Mazzoli, Frederick Rzewski, and many others. July 30, 4-10 p.m., North Adams. 413-662-2111, www.massmoca.org

BOSTON LANDMARKS ORCHESTRA Led by music director Christopher Wilkins, the Landmarks Orchestra continues its popular series of free Wednesday night concerts with a program titled “Verdi and Valkyries.’’ Special guests include soprano Jane Eaglen, One City Choir, Back Bay Chorale, and North End Music and Performing Arts Center Children’s Choir. July 27, 7 p.m., Hatch Shell at the Esplanade. 617-987-2000, www.landmarksorchestra.org JEREMY EICHLER