Comping refers to playing chords underneath a song's melody or another musician's solo improvisations. A similar pattern notation is used for chord comping and bassline patterns. The freedom of comping musicians to improvise passing chords also depends on the tempo. Likewise, Kottke's accompaniments and unfocused comping fail to lend any energy to the arrangements. Wynton Kelly and Herbie Hancock are examples of pianists who are responsive when comping. By comping, pianists, organists, and guitarists provide the "glue" that holds the rhythm section together. One solution is for the two comping instrumentalists to play sparsely. His comping often consisted of single bass notes outlining the root and fifth. His comping behind the other soloists is reasonably competent if perfunctory. In the early days not all leading pianists were concerned to provide comping. Comping is support of other musicians, often soloists, and echoing or reinforcement of the composition.