Classically, singing maintains a strict conformity (congruence) between the prosodic structure induced by the text and the musical and rhythmic structures defined by the staff. However, careful acoustical analysis of some contemporary French songs interpreted by renowned artists reveal various strategies to define a singer style which will to some extent incorporate melodic gestures pertaining to speech and not to music. In this study, we examine a few samples of these strategies, showing various cases between the total dominance of the musical structure over the speech prosodic structure to its total independence.