INNER URGE was Henderson's fourth date as a leader for Blue Note Records, and the first time he set out to record without his trusted friend, trumpeter Kenny Dorham. This release features "Isotope," now a well-known Henderson tune, and a lively version of the standard "Night and Day." Clearly the record's most memorable track, however, is the explorative "El Barrio," a droning piece that offers listeners a plethora of rich musical textures, modal detours, and percussive explosions.