A Minister's Wife and Adding Machine are two favourites of mine. Joshua Schmidt is a genius composer that more people should know.
One of my favourite musicals is Spoon River, which left me a weeping mess when I first saw it in Toronto. I've since seen it four times.
If you're not from New York, chances are you may not have heard of Dave Malloy's Ghost Quartet. Viscerally affecting, and that SCORE.
Calvin Berger is a hilarious, heartfelt piece of musical theatre for young audiences. Barry Wyner wrote a melodic pop score with clever lyrics.
Come From Away is a musical about a small town in Newfoundland during the 9/11 attacks. I saw it in early workshops here in Toronto a few years ago and it is moving through a very successful path. It's currently running at Seattle Rep.
Jeremy Schonfeld's Drift is a song cycle about divorce and what it takes to move on. As a child of divorce, much of this show resonates. And the rock score is strong.
The Theory of Relativity is another great song cycle by Neil Bartram and Brian Hill (same composing team behind Story of my Life). There are some pleasing melodies and emotional storylines.