Just do a search for something like "music ear defenders/protectors" and you'll see plenty of options.
Don't go for the cheap disposable rubber foam ones because those just block your ears. Look for proper reusable silicone ones. They are specially designed to block harmful frequencies without muffling or distorting the sound.
Yep, been using Etymotic ones for both concerts and riding motorcycle, and I love it. It works just right, and for $15 feels like worth every penny (ER20XS; went with that one over the regular ER20 because of a lower profile shape). They are nearly indestructable and super easy to clean too (relevant if your ears tend to produce a solid amount of earwax). Had to replace them once over the years and only because i lost my original pair.
Really comfy, non-descript, very easy to put in and remove, and only blocks out the annoying stuff while making the necessary stuff more prominent (with music, it would be amplifying guitars/synths as well as speech, while cutting down a bit on drums; with motorcycle, it would be amplifying breaking sounds, sirens/horns, and, again, speech, while cutting down on wind and engine noise). I can wear them for hours, eventually forgetting that I even have anything in, despite usually being really sensitive to earbuds and not being able to wear them for prolonged periods of time.
I've used Etymotics for years. Cheap ($20), comfortable, easy to carry, and a wonderfully flat frequency response (at least compared to cheap foam plugs).
Also, Etymotics makes great wired ear buds.
I just got the new eargasm, yea that's the name of the company, that can switch between -15db and -22db. Pretty good and better deal and sound quality than using regular foam earplugs. They are pricey around $45-$50, but if I don't lose them, worth the price for protecting my ears and better experience. There are ones cheaper, search high fidelity, HiFi, earplugs. Lots around the $20-$30 range.
