Congratulations on your acceptances. A third vote for NU, with both other schools behind in the dust. You will adjust to the weather, same as the other 9M people who live in Chicagoland.
There is much NU social life outside Greek life…about 20% of students are in Greek life, so obviously 80% are not. I can’t speak to music opportunities if you aren’t a major, but that should be relatively easy to find out with a phone call or two.
Good luck.