If they're interested in blues and European folk music, and they can write comprehensible English, then the more the merrier. God knows that'd put them above some people already here... ;-) One big damper on African and East European input though is simply that the internet doesn't reach there yet (or not to any real numbers of people). Also need to consider cost, not just of a PC but also of an instrument (most people get into folk and blues by getting a guitar).

Another factor too. To make a sweeping general statement, interest in blues and European folk music are uncommon amongst some of the groups you've listed, because it's not traditional for their society, so they'd have to make more of an effort to get out and play it (or they're maybe less likely to have heard music which would influence them that way). And amongst younger blacks, it seems to me that blues is often regarded in a similar way as folk is amongst younger whites - music for old farts stuck in the past. In both cases, when people actually hear the real thing then they'll enjoy it, but it isn't generally considered cool - you certainly won't hear it on commercial radio or see it on TV, except in parody form which reinforces that image.

Graham.