In 2001, the Gonzalez brothers coaxed their father out of musical retirement to play with them in a free jazz trio, Yells at Eels, which has toured the world and made numerous recordings. They have also played together in Portuguese guitarist Luis Lopes’ Humanization Quartet. Aaron is a regular participant in the North Texas experimental music scene. Stefan has a solo grindcore performance art project, Orgullo Primitivo, and recently returned from a tour of Europe as a member of bassist Ingebrigt Haker Flaten’s fiery Chicago-Texas free jazz hip-hop unit, the Young Mothers. Aaron’s deep sound on bowed or plucked upright recalls Charlie Haden, and his pizzicato fluency translates well to the electric bass. Stefan does much more than groove and swing with whirlwind intensity; indeed, he can match a melodic soloist phrase for phrase on the traps.