A big-band horn section can play the correct rhythms, pitches, and dynamics with good tone and still be unintelligible. If the horns articulate together, however, the improvement will be dramatic. They will much more successfully convey the meaning of the music, and they will sound like a section rather than four or five individuals. In this article, the author addresses the important issue of jazz articulation for the big band and discusses one approach to jazz articulation, tonguing, that can serve as a rule of thumb for students to follow most of the time. (Contains 7 figures.)