Rock-band boxes are a type of storage container used to store and transport musical instruments, amplifiers, and other equipment. The term 'rock-band boxes' is derived from the fact that they are often used by rock bands to store and transport their equipment. The crossword solution for the term 'rock-band boxes' is AMPS, which stands for amplifiers. Amplifiers are an essential part of any rock band's setup, as they are used to increase the volume of the instruments and vocals. Rock-band boxes are designed to protect the amplifiers and other equipment from damage during transport.