I've heard some old-style Polynesian singing(from near Tahiti) that definitely uses non-Occidental scales. A million miles from modern sweet Maori/Polynesian/Hawaiian harmonically based stuff. Conventional three-ch0rd trick hymn harmonies and guitars transformed African and Pacific music completely: it's nice to know there's still a few pockets of resistance, but I imagine they are few and far between now, unless close to the Asian mainland.
Where Jesus arrived, so did G/C/D7 !!