One night in 1979 Derrida was listening to his son Pierre talking with Paul de Man; they were discussing musical instruments after a jazz concert in Chicago. Here is what Jackie recalls:
It was then I realized that Paul had never told me he was an experienced musician and that music had also been a practice with him. The word that let me know this was the word "âme" when, hearing Pierre, my son, and Paul speak with familiarity of the violin's or the bass's soul, I learned that the "soul" is the name one gives in French to the small and fragile piece of wood--always very exposed, very vulnerable--that is placed within the body of these instruments to support the bridge and assure the resonant communication of the two sounding boards.
Jacques Derrida, Memoires for Paul de Man (1989); this part trans. by Kevin Newmark
Always a piece on the fringe that attract Derrida's attraction. And generally speaking, soul resides on the edge of things, it seems!