This is Andrea Giacomelli’s nickname for musical stuff.
Jack is one of the creators of the Metalliferous Hills Jug Band (i.e. Jug Band dalle Colline Metallifere project. This is an inter-generational and international collective based in Southern Tuscany, started in March 2017, as a development of multiple years of activity in outreach and community engagement initiatives. It is active in the production of events where live music and outreach on land an environmental issues are mixed in an educated way to provide a pleasant, entertaining, and instructive experience.