Holy Cross - fits your criteria on a number of points
Moderate, Smart kids, Strong poli sci department with Washington D.C. semester and an honors program for upper classmen, Cold weather & snow for sure, really nice kids, active LGBTQ group on campus supported by administration and alums, good amount of LGBTQ faculty/staff as identified on web-site, Kids work hard but are not cut-throat, No Greek life. Don’t know a lot about the music program, but they do offer a music scholarship, so assuming the program is fine, and they are building a new arts center, and did I say really really nice kids.