The musical trio EVIYAN was born in vocalist-violinist Iva Bittová’s house in the woods of the Hudson Valley after a few bowls of mushroom soup. In that rustic setting, performer-composers Bittová, Gyan Riley and Evan Ziporyn came together for the first time to create the kind of loose musical tapestries — weaving elements of the classical, folk, jazz, minimalist and global traditions — that debuted to high acclaim on Saturday, March 2 at MIT’s Kresge Auditorium. “It felt like a family reunion,” says Ziporyn, Kenan Sahin Distinguished Professor of Music and Faculty Director of the Center for Art, Science & Technology.