I woke up this morning to find a message from eBay offering 15 percent off some items, including musical equipment. So I pasted the code into an order for an amp I had been thinking about getting. And it failed. So I tried another seller. And it failed. So not knowing the word "defeat" I tried it on another four dealers and it failed ... failed ... failed ... and finally failed. So I thought maybe it was that item or that manufacturer. So I tried another product. And it failed. I then checked the fine print, as it were, and found that yes, it was for musical gear, but only for a very, very, very narrow group of gear, mostly some live gear. No guitars, amps, strings, accessories, etc. Oh, well .... Btw, that code is PICKSUMMER15. It is also apparently good on some other items.