An unsigned band is a band that is not signed to a record label and often releases their own material. The document discusses how unsigned bands in Norwich perform primarily at venues like the B2 and Brickmakers pub by contacting the venues. It also explains that to get signed, a band needs to demonstrate they are a good investment and will sell music well, sometimes doing extra work. The document interviews an unsigned local Norwich band called Laps Around the Lake, who discuss the challenges of finding shows and getting a label response to their demos.