RAM is not strictly necessary. If you're using a flash chip (which I'm assuming is the intention, rather than a one time programmable chip) you can store song data on the same chip, since teh chip is divided into sectors. As a matter of fact, I may be interested in getting 4 of those boards, bare. I once got the opportunity to pick chips from stuff that was going to be thrown away. Among those were 4 pieces of PA28F400 in a PSOP 44pin package. This is an Intel flash chip with a 16 bit bus, which I thought might come in handy one day. I wouldn't be surprised if the pinout and package type matches, in which case I would be interested in having 4 of those boards for use with those chips.