The Buddy Brennan Quartet is an instrumental jazz ensemble known for their incorporation of swing and bebop styles. Led by the eponymous Buddy Brennan, a noteworthy pianist, the group has contributed to the jazz scene with their distinctive improvisational techniques and rich harmonic language. Their notable works, such as "Nightfall in Vermont" and "Streets of New Orleans", showcase their unique blend of traditional and contemporary jazz elements. The quartet has been influential in promoting the evolution of jazz music, particularly in the late 20th century.