Several Rappers, Plan B (Who?) Cold Play, Jazzie B (Who?), Justin Bieber, Lady Gaga (Who?) and other modern pop-stars are advising their fans to wear ear-plugs whilst listening to their mainly, "plastic produced music".
This is superb advice and young people listening to the above mentioned artists should definitely follow it. Because by wearing ear-plugs they do not only avoid getting the dreaded tinnitus, they also have the chance of saving their ears from being bombarded with the constant clap-trap of modern day rap and pop.
Listening to Bob Marley or Led Zeppelin, The Stones, Beatles, Estelle, etc, is highly recommended to listen to without ear-plugs because then young kids would get to hear some decent pop/rock/reggae music.
Of course young kids would beg to differ because they believe their generation of pop/rock stars is the best; hence the reason why their idols advise them not to listen to them without ear-plugs because they know many of their predecessors were far, far better; but they just love the money, so sod the quality.