Spudman
Luke Skyrawker
Here is a pretty good chart that shows you where various instruments and voice are positioned in the audio frequency spectrum and keyboard. This can be helpful for recording and live mixing among other things.
http://www.independentrecording.net/irn/resources/freqchart/main_display.htm
http://www.independentrecording.net/irn/resources/freqchart/main_display.htm