Support - relational function
From Improvisers' Networks Online Mediawiki
Support, The active underlayment to support other higher profile “voice(s)”.
When a solo, duo or trio becomes dominant (obvious), the other players in the group might cease playing, or provide accompaniment which supports the musical direction of the Flow as determined by a Solo or Dialogue. An obvious example of Support is drumming that sustains a tempo and punctuates the phrases of other instruments. Indeed, the function of Support is to enhance not only rhythm and phrasing but other aspects of a lead voice such as timbre (articulation, register, dynamic) and, if appropriate, pitch (harmonically, melodically).