Longoni actually began his music studies in the early 1970s in the Rock ‘n’ Roll and Rhythm and Blues genres, and at the same time he began studying clarinet at the Civic School of Milan. After graduating he continued his studies at the Chigiana Academy in Siena with Giuseppe Garbarino. He went on to win first place in the Cesena and Ancona music competitions. Since then, he’s collaborated with most of the orchestra in Milan, including La Scala, RAI, and Pommerigi Musicali.

Most of his work revolves around chamber music, particularly contemporary chamber music. He’s also been selected to premiere numerous new work for solo clarinet by composers such as Franco Dontano, Luis de Pablo, and Bruno Zanolini. Longoni is one of the founders of the Arnold Quintet, which has been active for more than 20 years, and with whom Longoni has won national and international competitions. The Quintet has performed for most major concert societies in Europe, including playing the world premiere of Luciano Berio’s “Ricorrenze” quintet at the Paris Ircam. Longoni now collaborates with the Divertimento Ensemble, the premiere Italian contemporary music group. He’s performed on Radio France, Deutsche Rudffunk, RAI, and Radio Svizzera, and has recorded with Ricordi and Stradivarius.

He teaches clarinet and bass clarinet at the Civic School of Milan.