Let me hear bands or musicians that are either popular only in you country or just not in any charts at all, that you think are great anyway. While I probably can't speak that many languages it can obviously include voice in your national language. Bonus points for modern version of folk music from your country.
I start with germany.
modern folk music:
Versengold
for a more rock version with medieval themes:
Saltatio Mortis
add on: a band that may become more widely known in the future, at least in Europe, because they are a candidate for this years eurovision song contest. its a chance but we never send good bands anyway.
Lord of the lost
Of course what you think is underrated is strongly influence by your own taste, same with the bands I named.
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