Pretty sarcastic and still absolutely catchy song about the new bands which say that they are "rock" bands but end up changing into anything as time passes and don't even need to play instruments anymore. Music has changed a lot. Before, there was an entire culture built around the best player of different instruments. Now, it's mostly pop and songs that don't really talk about important matters anymore. Hence, the "glamorous" part of it. It refers to a pure glit, but no essence.