NOTES_OF_OCTAVE = {
	0: ['C', 'B#'],
	1: ['C#', 'Db'],
	2: ['D'],
	3: ['D#', 'Eb'],
	4: ['E', 'Fb'],
	5: ['F', 'E#'],
	6: ['F#', 'Gb'],
	7: ['G'],
	8: ['G#', 'Ab'],
	9: ['A'],
	10: ['A#', 'Bb'],
	11: ['B', 'Cb']
}

def note_to_freq(note):
	
	note_no = note_to_note_no(note)
	return note_no_to_freq(note_no)
	
def note_to_note_no(note):
	
	octave = int(note[-1])
	note = note[:-1]

	note_no_oct = 1
	for note_no_oct, notelst in NOTES_OF_OCTAVE.items():
		
		if note in notelst:
			break
	
	corr_note_no_oct = note_no_oct - 8
	return corr_note_no_oct + (octave*12)
	
def note_no_to_freq(note_no):
	
	return 2**((note_no-49) / 12.0) * 440