1. A method implemented by one or more computing devices, the method comprising: identifying features of sound data from a plurality of recordings; calculating values for frames of the sound data from the plurality of recordings, each of the values based on: similarity of the frames of the sound data from the plurality of recordings to each other based on the identified features; and a priority that is assigned based on the identified features of respective said frames; and aligning the sound data from the plurality of recordings based at least in part on the calculated values.