Their sound at this point was completely different from, say, Arrival. You can tell its ABBA, yet it sounds so sixties-ish. Their earlier works just get better with time. Maybe because music and times have changed so much in the last 44 years, neither necessarily for the better...
Even though Frida sings in many other songs more well known than this one, it was this song in particular that got me to notice how much I love her voice. I find it so soothing. "Tropical Loveland" and "The King Has Lost His Crown" are two other lesser known songs where her voice is a pure treasure to listen to.