Trombonist Roswell Rudd turned 70 last November. Among his presents was the reformation of his first (and unrecorded) band, which played in the Dixieland style he favored before falling for free jazz in the ’60s. Rudd’s story is classic jazz, from sharing stages with Steve Lacy and Cecil Taylor to doing time playing in a hotel dance band. Geoffrey Himes talks to Rudd about his past accomplishments and recent interest in Mongolian music.