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| - For the creation of his works Sieni has often collaborated with illustrious visual artists, musicians and composers, such as Alexander Balanescu, Ennio Morricone, Steve Lacy, Francesco Giomi/Tempo Reale, Evan Parker, Stefano Scodanibbio, Grazia Toderi, Liliana Moro, Maurizio Nannucci, and Flavio Favelli.
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