I second CH above. For a musician, the disposable ear plugs are not sensible. They tend to be more uncomfortable, less effective and distort the sound, as they ( Well all the disposables I've met anyway) tend to reduce lower frequencies more than higher ones.

They're fine in a 3 hour parade with 60 drummers around you (been there, done that, got the body paint...), but if you want to wear them more than once in a while, get a set of proper musicians ones. They're not that expensive, and are well worth it.