That’s true, but the OP’s current base of matches appears conspicuously thin.
Union.
Regarding your interest in Canadian colleges, look into Mt. Allison and Acadia.
Clark,
Muhlenberg,
Wheaton (in Massachusetts).
@lovelybb - Connecticut College, St Lawrence and Sarah Lawrence all have active arts in addition to traditional science programs. They seem to be in your desired areas - St Lawrence is almost in Canada! 
Based on your geographical and other preferences, you should probably consider – at least as an exercise – every NESCAC LAC.
“Any recommendations for Canadian schools?”
I agree with the two that @merc81 suggested. Mount Allison is in New Brunswick. Acadia is in Nova Scotia. Both are very good small universities. The other that ended up in the “top 3” of my daughter’s list was Bishop’s University in Quebec. Bishops is a lot closer for us (it is only about 30 miles from the Vermont border). However, the other two are higher ranked and probably a bit stronger academically. We visited all three at least twice (once before applying, once after getting accepted). St Francis Xavier is also quite good (also in Nova Scotia), but slightly larger and harder to get to from where we live. Given that you are an American living in Massachusetts, all for you would cost about the same as U.Mass Amherst at current exchange rates.
Union
Skidmore
Franklin and Marshall
Muhlenberg
Ithaca, Skidmore, and UVM are all good options. I’m not sure UMass Amherst is a safety for any in-state students anymore but you should EA there to get one school in-hand.
Lawrence University (ok, well outside the New England preference) has good sciences and its Conservatory opportunities are more open to non-Con students than at some other schools. A very warm, welcoming community, also has very good fine arts.
Another option would be St Lawrence, in upstate NY, that might be more of a safety along with Lawrence, school runs bus transportation to Boston and New York for breaks. Wooster in Ohio is known to have good music, and is a lovely campus, with an east coast “feel.” Lawrence, St Lawrence and Wooster all do merit awards. Dickinson is another wonderful school, the opportunities there, including fine arts, are very impressive. Central PA, so not too far off the east coast grid, though not as accessible as schools up and down the eastern seaboard.
Kenyon and Denison both had 34% acceptance rate last year, a range which makes me nervous to call close to a safety, though both have great fine arts facilities. A high stat kid who interviews, communicates with Admissions, and takes other steps to demonstrate interest and show compatibility with campus values, may have pretty good chances, though not safety range.
I’ll be honest, my kid with equivalent scores rejected F&M as a safety because they don’t give merit. Assuming you are full pay, there are many comparable schools that will give you a reduced price to attend. F&M isn’t worth full pay for someone with your stats.
Sarah Lawrence science offerings are fairly limited (e.g. for chemistry, see https://www.sarahlawrence.edu/undergraduate/science-mathematics/chemistry/ ); its emphasis is on arts, some humanities, and psychology, as can be seen in its course catalog.
Check our CTCL schools. Many would offer generous merit.
Seconding (thirding) St Olaf: Excellent in the sciences and music, especially vocal music. (Their Xmas music festival is streaming next week, try to listen - it’s a top 10 Christmas event nationally.) 1/3 students are high level musicians.
If you can manage to send a recording with one song in English and one in a foreign language by their deadline, it becomes next to a safety as this indicates interest. (You’d be in the BA/non major category).
https://wp.stolaf.edu/musicadm/audition-repertoire-requirements-old/voice-audition-requirements/
https://wp.stolaf.edu/musicadm/admissions-instructions/
It’d be easier to get into than East coast LACs but has better academics than equivalent safeties closer to you.