Hi Arranger Keyboard Friends!

I just found a link to a "jazz piano" website which explains the concept of "rootless" piano chord voicings:
http://www.jazzoasis.com/Lessons/Piano/Basic%20Chord%20Voicings.htm

The "rootless chord voicings" recognized by the Technics & Yamaha arranger keyboards are a slight variation to the traditional jazz piano rootless voicings outlined in this article, but they still follow the same principle of including the 3rd and 7th of the chord plus a chord extension note (9th, 11th, or 13th), while leaving out playing the root of the chord altogether. Thus, only the auto-accompaniment bass instrument (acoustic bass) plays a bass line which includes the "root" of the chord.

As I mentioned in another thread, checkout any of Diana Krall's albums, she displays a wonderful example of rootless chord piano playing/comping. http://allmusic.com/cg/x.dll?p=amg&sql=1DIANA|KRALL

Scott