This weekend in the Washington Post, I offer a field guide to Gustav Mahler in honor of his anniversary. Take note of the listings of local Mahler events: this weekend you can hear Mahler’s 1st in Alexandria; Mahler’s 2nd in Fairfax, or see Visconti’s “Death in Venice” (with Mahler’s music as soundtrack) at the National Gallery.

Also: A new and much-touted CD shows Irish composer Donnacha Dennehy reclaiming Celtic music in a serious contemporary idiom, alongside a song cycle written for Dawn Upshaw.