This paper describes a preliminary algorithm performing the mapping of sound to music score. Our procedure is constructed over signal-extracted energy and fundamental frequency traces alone. The algorithm is tested on real songs of average complexity. Although results seem to be promising, their detailed examination reveals some shortages of our approach as well as the set of application specific problems. It appears that musical analysis can not be entirely dissociated from phonetic processing. Further work should be oriented towards integration of knowledge of music as well.