This AABA form consisting of four eight-bar phrases, as well as the 12-bar blues, are two of the mostcommon forms in swing and bebop styles. Only the A section contains a composed melody, the B section (the so-called “bridge”) has been leftopen for improvisation. This practice is also common in the bebop tradition. The melodic language of the theme resembles bebop, which is why we could considerInvisible as one of Jost’s first type of Coleman melodies28. The form of the melody isclearly an alternating sequence consisting of four call and response phrases. The melodic contour of Invisible also contains embedded note progressions or “stepprogressions”31. This technique was common already in bebop performance. The melody also contains a repeating rhythmic