19. The computational method of claim 1 , further comprising: mapping onsets of notes for the target song to temporally-proximate, segment delimiting onsets in the speech encoding; and for respective portions of the speech encoding that correspond to the mapped note onsets, temporally stretching or compressing the respective portion to fill duration of the mapped note.
19. The computational method of claim 1 , further comprising: mapping onsets of notes for the target song to temporally-proximate, segment delimiting onsets in the speech encoding; and for respective portions of the speech encoding that correspond to the mapped note onsets, temporally stretching or compressing the respective portion to fill duration of the mapped note. 20. The computational method of claim 19 , further comprising: characterizing frames of the speech encoding based, at least in part, on spectral roll-off, wherein generally greater roll-off of high frequency content is indicative of voiced vowels; and dynamically varying magnitude of the temporal stretching applied to a respective portion of the speech encoding based on the characterized vowel-indicative spectral roll-off for the corresponding frame.