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polabet4dVery fast presentation of my 4D Models for Mathemusic. in 2020 Planet 4D models are geometrical vizualisations for Music Tonal Music TriadsChords ATonal, Spectral, Non equally->Some isometries in the Tonnetz discovered by G. Mazzola and formalized in the 4D space by Emmanuel.Amiot and Guillaume Baxias.->Hypersphere of Tonnetze, is a graphical illustration