Hello Vault dwellers just a question that's been irking for for a long time

yes I know that fallout universe didn't experience or get to find transistors instead they improvised on nuclear technology, but then can anyone explain why the radio is like old songs only? am I missing something here? maybe rock, metal, pop requires transistors? if they don't i wonder why I don't hear rock music from radio idk the correct explanation so anyone could lend me a hand? thanks in advance