1. A computer-implemented method for estimating pitch, the method comprising: obtaining a frequency representation of a first portion of a signal; obtaining a first pitch estimate for the first portion of the signal; identifying a plurality of frequency portions of the frequency representation using the first pitch estimate, the plurality of frequency portions comprising a first frequency portion and a second frequency portion; computing a plurality of correlations using the plurality of frequency portions, the plurality of correlations comprising a first correlation between the first frequency portion and the second frequency portion; computing a first score using the plurality of correlations; and computing a second pitch estimate using the first score.