Start with denatured alcohol. Then try mineral spirits (we call it "paint thinner" but you don't actually thin paint with it; white spirits or paraffin oil in your land?) or naptha (lighter fluid). We have a mix of toluene and other solvents called "goo gone" which is used to remove dried latex (emulsion) paint, and that should work. Last resort is acetone or MEK (methyl ethyl ketone) or lacquer thinner (a mix of acetone and some other solvents). Be sure to use plenty of fresh rags or heavy paper towels because you might just wind up smearing the stuff all over. It's also possible to use paint stripper, especially if you use one of the milder ones that are "friendly" or citrus based, just as long as you don't leave it on very long then the Tolex will be relatively unaffected (test a small spot first, etc. etc.). At worst you'll knock the gloss off a little. I don't think you can get it back to new condition but you can at least remove the other band's name. Unusual they'd do that in the first place unless it was a road case.
"Why don't you just make 10 louder, and make 10 be the top number, and make that a little louder?"