"4 + 1 Ensemble" is a captivating avant-garde and free jazz album by the innovative composer and pianist Wayne Horvitz, released on January 1, 1998, under the Intuition label. Clocking in at a concise 40 minutes, this album is a testament to Horvitz's ability to push boundaries and explore uncharted musical territories. The nine-track collection, featuring pieces like "Step Aside," "Up All Night," and "Exit Laughing," showcases a dynamic interplay of improvisation and composition, with Horvitz's distinctive style shining through. His work is known for its intricate structures and bold experimentation, and this album is no exception. "4 + 1 Ensemble" is a compelling journey into the world of avant-garde jazz, offering a rich and immersive listening experience that highlights Horvitz's mastery of the genre.