In the present research we look into the mechanisms which facilitate integrated functioning of speech and music components within a song. To understand the underlying mechanisms of such interaction we investigate poems set to music, analyzing the components of both speech and music intonation. The study is performed within the scope of Speech Energetic Theory and employs its idea of the emotional-and-pragmatic potential, which is believed to precisely convey the idea of a poem and therefore further facilitate successful speech-music interaction within a song. During the experiment the levels of emotional-and-pragmatic potential in poems and songs were firstly determined perceptively by the informants and afterwards verified instrumentally by using specifically developed formula for the evaluation of emotional-and-pragmatic potential. The values of the intonation components were obtained with the help of PRAAT software. Overall, the results demonstrated that that speech and music profoundly correlate on the prosodic level, possessing some common auditive and acoustic features.