06 March 2007 to 08:13Tutorial - Recommended EQ Frequencies (Equalisation)#1
I remember that this was one of the most difficult things to remember / master when I was learning. This page tells you exactly where each instrument / voice pitch lies within the hearing range (20hz. - 20Khz.)
I would say that this is an absolutely invaluable tool for anyone starting out of their journey into music production!