>>8889753I might have seen one of the guitars, but they don't come up often.
>>8889771 mentioned F-Toys, which aren['t so much rare as pricey. Media Factory did 1:12 guitars, basses, amps and I believe a drum kit for the anime/manga Beck, but that stuff is all old and expensive on the secondary market. These are an option, if precise detail isn't a concern.
https://www.ebay.com/itm/1-12-Miniature-Drum-Pearl-Bass-Guitar-Musical-Instruments-Display-Exclusive/164673798205?hash=item265752c03d:g:1bsAAOSwyuNgE3WOAnother potential option is Loyal Subject's Bst Axn line. The figures are 5", but if you aren''t going too far on the 1:11 end of 1:12, they may work. They're supposed to be doing at least a couple of members of KISS, Angus Young Slash and Ozzy Osbourne. They're current, and not terribly expensive if you aren't dealing with eBay. Your big hurdle is always going to be the drums.