If two musical notes are an octave apart, the frequency of the higher note is twice that of the lower note. The note referred to as middle C (C4) usually has a frequency of 262 Hz (although there is some variation). What is the frequency fC6 of a note that is two octaves above (higher than) C4 in pitch? fC6= __ Hz (This answer is 1048) If a certain string on a viola is tuned to concert A (A4) by adjusting its tension to FA4, what should be the tension (in terms of FA4) of the string, FA3, SO that it plays a note one octave below concert A? FA3= FA4