15. At least one computer storage media that is not a signal per se, the computer storage media comprising: memory that comprises computer-executable instructions that, based on execution by a computing device, configure the computing device to: match an audio rendition to an audio recording based on alignment of pitch contours of the audio rendition and a portion of the audio recording, and further based on similarities between pitch intervals and durations of notes of the aligned audio rendition and the aligned portion, where the pitch contours each indicate any variation in pitch of a note of the notes relative to a previous note of the notes, where the pitch intervals each indicate a frequency of the note, and where the durations each indicate a length in time of the note; and add, by the computing device based on a weighting of the portion of the matched audio recording, the matched audio recording to a selection set.
15. At least one computer storage media that is not a signal per se, the computer storage media comprising: memory that comprises computer-executable instructions that, based on execution by a computing device, configure the computing device to: match an audio rendition to an audio recording based on alignment of pitch contours of the audio rendition and a portion of the audio recording, and further based on similarities between pitch intervals and durations of notes of the aligned audio rendition and the aligned portion, where the pitch contours each indicate any variation in pitch of a note of the notes relative to a previous note of the notes, where the pitch intervals each indicate a frequency of the note, and where the durations each indicate a length in time of the note; and add, by the computing device based on a weighting of the portion of the matched audio recording, the matched audio recording to a selection set. 16. The at least one computer storage media that is not a signal per se of claim 15 wherein the audio rendition comprises humming.