Expression is an album by jazzsaxophonistJohn Coltrane. The title track was Coltrane's last studio recording; the rest of the album was recorded at about the same time as Interstellar Space. "To Be" features Coltrane on flute, the only recording he made on the instrument for an entire track. As for the rest of the album, Coltrane's tenor seems to have acquired a denser, wider sound while retaining the free form of the late years. This is most evident on "Offering," which follows its theme into a particularly radical example of overblowing.