GUEST, Richie: JSTOR is a non-profit organization, but they do not focus on one particular area of research (such as musical heritage), but rather on trying to make a very broad range of material available to researchers. What they do, which is basically to scan hundreds of scholarly publications into an Adobe .pdf database, is very labor intensive, which is expensive. I also doubt that the publishers of these journals allow JSTOR to copy their copywrighted material for free. Somebody has to pay for it, and, yes, it would be nice if a foundation would do it all, but the reality is that the users pay, through taxes, university tuition, and so forth.

There are organizations that specialize in musical archiving of one type or another and, perhaps if you be more specific regarding what you are looking for, there may be someone here who can put you on the track of an archive that would meet your needs.