The term 'Rock Music Boosters' refers to amplifiers, which are four-letter devices used to increase the volume of sound. Amplifiers are an essential part of rock music, as they allow the sound to be heard at a much higher level than it would be without them. They are also used to create a variety of different sounds and effects, such as distortion and reverb. Amplifiers are typically connected to a speaker, which then projects the sound out into the room.