Recorded live in Rotterdam, Holland on October 28, 1967, it features Thelonious Monk playing with both a quartet and octet line-up on classic Monk tracks like "Ruby My Dear" and "Blue Monk" as well as "Hackensack" with both the quartet and octet line-up.
Track listing: 1. Hackensack 2. Ruby My Dear 3. Blue Monk 4. Hackensack