deletions | additions       diff --git a/Music.tex b/Music.tex  index c1e33b6..4221344 100644  --- a/Music.tex  +++ b/Music.tex 
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In music, a \textit{note} is the most basic element. A note is based on pitch, a subjective and perceptual property rather than an objective physical property. Though the pitch of a note is closely related and usually identical to its objective physical frequency (as measured in Hertz, or cycles per second, of a waveform), pitch differs in that its semantic meaning is derived from the listener. A note also consists of a duration.  The divergence between exactly measurable and calculable to subjectively derived from perception---at the most basic element of music---gives birth to the field of \textit{music informatics retrieval} (MIR), devoted to automatically extractinginformation and  data and classifying features  from works of music. \subsection{Chords and Harmonies}