Well, what sort of musicals do you like in general? Do you want to expand your tastes or find more good stuff like what you already listen to? I’m just going to go through everything now :) Psst, ‘cast recording’ is the preferred term; ‘soundtrack’ refers to movies and TV shows.
There have been many musicals produced over The Last Five Years (hahaha) or so that step away from the traditional Broadway sound. The main two that come to mind are In The Heights and Spring Awakening, plus a host of jukebox musicals. There’s nothing wrong with liking Jersey Boys (The Four Seasons), Rock of Ages (classic rock), The Marvellous Wonderettes (50s and 60s classics) or Priscilla Queen of the Desert (pop songs) if all you’re after is good music.
Other recent successful musicals are [title of show] (seriously, if you don’t know about this one and you’re really into MT, get into it already!), Next to Normal (deals with dysfunctional families and mental illness, I didn’t like this one personally), The Light in the Piazza (score by Adam Guettel, grandson of Richard Rodgers, talent runs in the family), 13 the Musical (I usually hate shows about kids, but this is awesome) oh, and Legally Blonde and Shrek the Musical (I don’t care what everybody else says, they are both so much fun!)
If you’re feeling adventurous, you could have a look into foreign musicals. The ones by Kunze & Levay would be a good place to start. An English translation of their Rebecca (based on the novel by Daphne du Maurier) should be opening either on Broadway or the West End in the next couple of years, and also check out Elisabeth, which will probably follow if Rebecca is a success. La Révolution Française was the first musical written by Boublil and Schönberg, at least listen to ‘Au Petit Matin’. Another French success, Mozart l’Opéra Rock, is extremely popular with the young people and I believe it will soon be crossing to America.
Okay, other musicals that may have passed you by: Victor/Victoria (the last musical Julie Andrews did before her operation, make sure you listen to the Broadway production, not the movie), She Loves Me (the 1994 London revival did fantastically at the Oliviers), Repo! The Genetic Opera (it’s just a movie, and it was directed by the guys who did Saw, but just look it up, okay?), Passion (plus anything else by Sondheim that you may be unfamiliar with), 110 in the Shade (by the same guys who wrote The Fantasticks, Audra McDonald sounds brilliant in the revival cast album), Jekyll & Hyde (please get the Complete Work with Anthony Warlow), A Very Merry Children’s Scientology Pageant (no, really!).
I could suggest more if you let us know what you like!