Listening to "Fiddler on the Roof" and klezmer music unsettled to me the idea that major is happier than minor. I still think minor tends to sound "sad", but those wedding songs and the Russian dance in FotR are clearly upbeat and celebratory. (Literally upbeat; the Russian dance is more upward-beat, as it gets faster and faster!)
Yes, the klezmer “default” is minor and upbeat.
It’s my favorite example for the “minor != universally sad across cultures” thing since it’s not so “out there” for the Western ear that people would struggle to even hear minor/major/“music” in it at all.