When it comes to aesthetics, Heidegger may remain almost dumb about music, he appreciated it, and even was inspired by it. We would be at least well inspired to consider it from a hermeneutical point of view. To understandindeed a thought which confides only in one who knows how to "see in thought" and to understand a thinker who persuades that "hearingisseeing" and seeinghearing, it is not vain and rather sensible to envisage his words as notes, his texts as partitions, that reading would make listen to and that listening would mean reading. Making the hypothesis of a Beitrage zur Philosophie's writing like a fugue, even of Sein und Zeit's writing like a sonata form, we try to imagine Heidegger as a composer and to discover the influences which he undergoes. That of Mozart, of course. That of Bach even more.