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The plot OP shared looks similar to log magnitude spectrum(black line) plotted with its envelope(red line). so from what OP says, OP need to plot log magnitude spectrum of recorded audio/signal. One thing to remember for this analysis is that same note should be played for entire duration of the signal to be analysed. if not, one should use proper windowing methods to ensure that signal remains stationary(in same note) for the entire duration of window under analysis. I am assuming that a note corresponds to a few particular frequencies. 

The plot OP shared looks similar to log magnitude spectrum(black line) plotted with its envelope(red line). so from what OP says, OP need to plot log magnitude spectrum of recorded audio/signal. One thing to remember for this analysis is that same note should be played for entire duration of the signal to be analysed. if not, one should use proper windowing methods to ensure that signal remains stationary(in same note) for the entire duration of window under analysis. I am assuming that a note corresponds to a few particular frequencies.

that is the way if you want to plot/analyse a graph similar to the one shared. are you also looking for other methods for determining the peaks corresponding to a particular note at a time?

The plot OP shared looks similar to log magnitude spectrum(black line) plotted with its envelope(red line). so from what OP says, OP need to plot log magnitude spectrum of recorded audio/signal. One thing to remember for this analysis is that same note should be played for entire duration of the signal to be analysed. if not, one should use proper windowing methods to ensure that signal remains stationary(in same note) for the entire duration of window under analysis. I am assuming that a note corresponds to a few particular frequencies. 

that is the way if you want to plot/analyse a graph similar to the one shared. are you also looking for other methods for determining the peaks corresponding to a particular note at a time?

The plot OP shared looks similar to log magnitude spectrum(black line) plotted with its envelope(red line). so from what OP says, OP need to plot log magnitude spectrum of recorded audio/signal. One thing to remember for this analysis is that same note should be played for entire duration of the signal to be analysed. if not, one should use proper windowing methods to ensure that signal remains stationary(in same note) for the entire duration of window under analysis. I am assuming that a note corresponds to a few particular frequencies.

that is the way if you want to plot/analyse a graph similar to the one shared. are you also looking for other methods for determining the peaks corresponding to a particular note at a time?

6 added 4 characters in body
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The plot OP shared looks similar to log magnitude spectrum(black line) plotted with its envelope(red line). so from what OP says, OP need to plot log magnitude spectrum of recorded audio/signal. One thing to remember for this analysis is that same note should be played for entire duration of the signal to be analysed. if not, one should use proper windowing methods to ensure that signal remains stationary(in same note) for the entire duration of window under analysis. I am assuming that a note corresponds to a few particular frequencies.

The plot OP shared looks similar to log magnitude spectrum(black line) plotted with its envelope(red line). so from what OP says, OP need to plot log magnitude spectrum of recorded audio/signal. One thing to remember for this analysis is that same note should be played for entire duration of the signal to be analysed. if not, one should use proper windowing methods to ensure that signal remains stationary(in same note) for the entire duration of window under analysis. I am assuming that a note corresponds to a few particular frequencies. 

that is the way if you want to plot/analyse a graph similar to the one shared. are you also looking for other methods for determining the peaks corresponding to a particular note at a time?

The plot OP shared looks similar to log magnitude spectrum(black line) plotted with its envelope(red line). so from what OP says, OP need to plot log magnitude spectrum of recorded audio/signal. One thing to remember for this analysis is that same note should be played for entire duration of the signal to be analysed. if not, one should use proper windowing methods to ensure that signal remains stationary(in same note) for the entire duration of window under analysis. I am assuming that a note corresponds to a few particular frequencies.

that is the way if you want to plot/analyse a graph similar to the one shared. are you also looking for other methods for determining the peaks corresponding to a particular note at a time?

The plot OP shared looks similar to log magnitude spectrum(black line) plotted with its envelope(red line). so from what OP says, OP need to plot log magnitude spectrum of recorded audio/signal. One thing to remember for this analysis is that same note should be played for entire duration of the signal to be analysed. if not, one should use proper windowing methods to ensure that signal remains stationary(in same note) for the entire duration of window under analysis. I am assuming that a note corresponds to a few particular frequencies. 

that is the way if you want to plot/analyse a graph similar to the one shared. are you also looking for other methods for determining the peaks corresponding to a particular note at a time?

5 deleted 19 characters in body
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The plot you haveOP shared looks likesimilar to log magnitude spectrum(black line) plotted with its envelope(red line). so from what you sayOP says, youOP need to plot log magnitude spectrum of your recorded audio/signal. One thing to remember for this analysis is that same note should be played for entire duration of the signal to be analysed. if not, youone should use proper windowing methods to ensure that your signal remains stationary(in same note) for the entire duration of window under analysis. I am assuming that a note corresponds to a few particular frequencies.

abovethat is the way if you want to plot/analyse a graph similar to the one shared by you. are you also looking for other methods for determining the peaks corresponding to a particular note at a time?

The plot you have shared looks like log magnitude spectrum(black line) plotted with its envelope(red line). so from what you say, you need to plot log magnitude spectrum of your recorded audio/signal. One thing to remember for this analysis is that same note should be played for entire duration of the signal to be analysed. if not, you should use proper windowing methods to ensure that your signal remains stationary(in same note) for the entire duration of window under analysis. I am assuming that a note corresponds to a few particular frequencies.

above is the way if you want to plot/analyse a graph similar to the one shared by you. are you also looking for other methods for determining the peaks corresponding to a particular note at a time?

The plot OP shared looks similar to log magnitude spectrum(black line) plotted with its envelope(red line). so from what OP says, OP need to plot log magnitude spectrum of recorded audio/signal. One thing to remember for this analysis is that same note should be played for entire duration of the signal to be analysed. if not, one should use proper windowing methods to ensure that signal remains stationary(in same note) for the entire duration of window under analysis. I am assuming that a note corresponds to a few particular frequencies.

that is the way if you want to plot/analyse a graph similar to the one shared. are you also looking for other methods for determining the peaks corresponding to a particular note at a time?

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