Actual Scottish Gaelic vocals over dungeon-crawler gameplay and it works absurdly well. Bard's Tale IV: Barrows Deep Volume 2 continues the series' commitment to authentic Celtic music and Nighean Ruadh Bhàn opens with this unaccompanied voice that sounds like it's echoing through stone halls.
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Snow in Summer is hauntingly still, just voice and sparse accompaniment. Gur Tu Mo Chruinneag Bhòidheach builds into something warmer, almost tender. The instrumental version of Across the Seven Realms strips away the vocals and lets you hear how intricate the arrangements actually are.
Ùrnaigh feels like a prayer in the dark. If you play RPGs for atmosphere and want a soundtrack that transports you somewhere ancient and real, this will do it.