Gianni Brezzo is the jazz-focused studio and band project of Cologne-based multi-instrumentalist and producer Marvin Horsch. The project is based in Köln and is associated with Horsch’s work as a composer, producer, and instrumentalist.

Its music combines jazz with instrumental hip-hop, ambient, and pop, and it is identified with a wide-ranging approach that moves between different scenes and styles. The project is centred on recorded studio work rather than a fixed band line-up.