music frequency

Not sure you're right about middle C. Someone else will have to chime in on that one. But here are two charts that should answer your question about orchestras:

http://www.listenhear.co.uk/general_acoustics.htm

http://www.dak.com/reviews/Tutorial_frequencies.cfm

My spectrum analyser indicates that the high end of most recorded music rolls off around 12-14 KHz most of the time. Sometimes (not often) there is significant signal up to 20 KHz. The low end varies greatly. Usually nothing below about 40 Hz, but again there are times when the 20 Hz third octave is as high as any other.

I know most acoustic instruments are between 50 hz and 3800 hz according to a chart in an old TAS magazine.