An interesting test is to listen to music sung in a language you don't understand and don't know. This either makes some folk reach for the non existent subtitles, listen to it and imagine the lyric or listen to it as sound.
One of the songs I love fits that description nicely. All the more so, I think, because we can understand some of it, but not other parts. I think it should be left to the listener to find out the language and the meaning. It's a lovely song also in translation, if perhaps a little unexpected.
+++ Yamore +++ by Salif Keita and Cesaria Evora.