So, I don't listen to that much calming music, but I do love instrumental pieces—especially epic music. Two Steps from Hell makes amazing music. Can I please assume that, though this is about instrumental music, we can also post songs in which vocals (usually as a choir) is more a part of the whole instrumentation? Because this is one of my favorite TSFH songs and it definitely has vocals. But they're gorgeous, and I don't recognize the language—it may be fictional.
I love this song and many others as inspiration for writing stories and RPing. (: