During Hong Kong's manufacturing heyday, industrial buildings were full of factories and workshops, churning out products that were exported all over the world. The manufacturers have since moved out of Hong Kong, and the spaces once occupied by them turned into chic offices, spacious art studios, and abundant music rehearsal spaces.

Inside one of these gritty behemoths, you might be greeted by classical piano notes flowing down from one hallway, and heavy-metal guitar riffs booming from another. But in one particular building in San Po Kong, you will be treated to the truly unique sounds of the accordion.