In a welcome return, the Grammy-nominated ensemble devoted to the works of American composer and maverick musician Harry Partch performs a program centered on the Marimba Eroica—one of Partch’s custom-designed instruments. Weighing in at 847 pounds and eight-feet in length, the Eroica generates tones even lower than the bass marimba. Partch wrote, “In the right room acoustically, the Eroica is felt through the feet, against the belly, and, if one sits on the floor, it ripples through [one’s] bottom. It is very difficult to put on tape, and especially, on records, with any fidelity.” Experience this rippling, earth-shaking concert event that includes the works Plectra and Percussion Dances and Dance Pantomime (King Oedipus).