1. The problem statement, all variables and given/known data I have made a plot of a given .wav file in Matlab. The problem asks: find the fundamental frequencies of the 3 vibrating strings, and identify some of their harmonics. 2. Relevant equations 3. The attempt at a solution So I made a Matlab plot of the power spectrum over the range 0 to 2000 Hz (the range we are required to plot): So how can I identify the fundamental frequencies using this plot (or by any other method)? And what would be their "harmonics"? Any explanation would be greatly appreciated.