They planned it out and executed flawlessly. The teens of drummer Elijah Baradi's Quintet were well prepared for their KNKX School of Jazz studio session. Unlike most groups of a high school age, this talented group from Interlake High in Bellevue played live on 88.5 without an adult mentor. They didn't need one. Drumming since age 6, Baradi drives a strong rhythm section. The sophomore teams with seniors Mert Selcuk on piano and Kai Wagner at the upright bass, an instrument this electric bass