Distinguishing 2 notes of a wav file.

I have a .wav file. I've obtained and plot the signal for a segment of between x(670000:689000). The plot shows about 2 different notes in the segment. How do I plot and determine the frequency of each notes? Below is my codes:

   clear all; close all; clc;
   [x,fs] = audioread('Bass.wav');
   x = x(670000:689000,:);
   sound(x,fs);
   t=0:1/fs:(length(x)-1)/fs;
   plot(t,x);
   n=length(x)-1;
   f=0:fs/n:fs;
   wavefft=abs(fft(x));
   plot(f,wavefft);

Answer 1

[Image Analyst]

Try fft() or pwelch() or spectrogram().