src:
http://en.citizendium.org/wiki/Beat_(music)
pdf:
https://drive.google.com/file/d/0B543p5wfySTQR2F0Tkx4bW5FU2c/edit?usp=sharing
notes:
14'7/20 :
downbeat : 1st beat of a measure
upbeat : the intrdouction for downbeat
backbeat : 2 , 4
offbeat : 1 & 2 & 3 & 4 & --> where '&' means offbeat
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