A Jazz Improvisation Primer, by Marc Sabatella - Detailed online course in jazz improvisation with pages in history, theory, and practical advice on playing in a group. Jazclass with Michael Furstner - A basic primer on jazz improvisation using chord root tones and chord guide tones. Sax on the Web: Tim Price - Selmer clinician from the New York area offers online instruction harmonic substitution, with exercises to improve phrasing and improvisation and a series of "Bird-ology" studies. Swing and Jump Blues Guitar - Matthieu Brandt, a guitarist from Amsterdam, Netherlands, offers detailed progressive lessons. Topics include chords, riffs, comping, turnarounds, and timing. Guitar Lesson World by Patrick MacFarlane - Progressive series of guitar lessons for the improvising musician, including soloing and comping. Jazz Arranging Tutorial - Web-based instruction in jazz ensemble writing. Based on charts for the University of Northern Colorado Jazz Lab Band. Offered by Alabama State music professor Doug Bristol.