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If the problem that you are actually addresing is audio/speech signal segmentation and distinguishing between the speech and music, see:

Theodorou T., Mporas I. and Fakotakis N., "Automatic Sound Classification of Radio Broadcast News", Int. J. Sig. Proc., Image Proc. Pattern Recognition, 5(1), 2012

I could be wrong on this but Praat seems to be not so usefull for polyphonic music analysis, except if augmented with some additional pre-filtering for the purpose of segmentation:

Makarand Ramesh, V.; Sahasrabuddhe, H.V.; , "Exploring Data Analysis in Music Using Tool Praat," Emerging Trends in Engineering and Technology, 2008. First International Conference on, pp.508-509