Since a specific, widely recognized textbook titled "Manuale di Teoria Musicale" by an author named is not part of the standard Italian conservatory curriculum (which typically uses texts by authors like Daniele Tealdi, Lida Biancoli, or Dante Ristori), it is highly likely you are referring to Michelangelo Fulgoni , an Italian musician and educator known for his online presence and educational materials. Mylifeinmiami 25 01 04 Emily Vergara Big Tits B Better Link
Currently, Michelangelo Fulgoni is best known for his (often associated with "GnamGnamStyle" or independent music tutorials) and his modern approach to teaching. Naughty Sandbox -2021-05-31- -naughty Sandbox- We Were Told