planet 4dGeneralized Tonnetze, Spectral Applications. ->Some isometries in the Tonnetz discovered by G. Mazzola and formalized in the 4D space by Emmanuel.Amiot and Guillaume Baxias.Very fast presentation of my 4D Models for Mathemusic. please see in playlists for more detailed content, and conferences. Planet 4D models are geometrical vizualisations for Music Tonal