Anyone who blasts music at jet engine levels to mask outside noise is just plain stupid.
Since I've invested a fair amount of money on high end audio equipment (iPod included) I like to consider myself an audiophile of sorts, and even when going to concerts I carry a pack of silicone earplugs with me. Killing my ears exposing myself to bare loud noises for a long time wouldn't only render my big investment useless... it would make me deaf, and that definitely would suck in every way you can imagine.
So, if anyone can blow out $300 or $400 to get the fanciest, schmanciest iPod in the market, they certainly can pony up to get some noise-cancelling headphones or earplugs. I use a pair of Sennheisers (PX200 model, I think it is called) and sound is not only amazing, but it also masks outside noises so you don't have to blast the volume out to hide them. They cost me like $50 or so... worth looking for.
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"Many people would rather die than think; in fact, most do." - Bertrand Russell