David Yazbek - twice it's worked for me.
A few people have come up with scores I like, even though their previous work never impressed me, including William Finn (Spelling Bee)and Jason Robert Brown (13).
I think that NEXT TO NORMAL is the most compelling score I've heard in many seasons, but I still cringe recalling High Fidelity - hopefully N2N is more representative of what they can and want to do.
As for Sondheim .... most of his scores are on my "favorites: list, but really, what has he turned out recently? I hardly think of him as a "current composer/lyricist" since the most recent "new" shows have been revisions of revisions. How many more times will ASSASSINS and ROAD SHOW/BOUNCE/whatever get tweaked and performed? Fortunatel, there are enough Sondheim shows so that we get regular revivals to remind us of how great musical theatre can really be.
2016 These Paper Bullets (1/02) Our Mother's Brief Affair (1/06), Dragon Boat Racing (1/08), Howard - reading (1/28), Shear Madness (2/10), Fun Home (2/17), Women Without Men (2/18), Trip Of Love (2/21), The First Gentleman -reading (2/22), Southern Comfort (2/23), The Robber Bridegroom (2/24), She Loves Me (3/11), Shuffle Along (4/12), Shear Madness (4/14), Dear Evan Hansen (4/16), American Psycho (4/23), Tuck Everlasting (5/10), Indian Summer (5/15), Peer Gynt (5/18), Broadway's Rising Stars (7/11), Trip of Love (7/27), CATS (7/31), The Layover (8/17), An Act Of God (8/31), The Curious Incident of the Dog in the Night-Time (8/24), Heisenberg (10/12), Fiddler On The Roof (11/02), Othello (11/23), Dear Evan Hansen (11/26), Les Liaisons Dangereuses (12/21) 2017 In Transit (2/01), Groundhog Day (4/04), Ring Twice For Miranda (4/07), Church And State (4/10), The Lucky One (4/19), Ernest Shackleton Loves Me (5/16), Building The Wall (5/19), Indecent (6/01), Six Degrees of Separation (6/09), Marvin's Room (6/28), A Doll's House Pt 2 (7/25) Curvy Widow (8/01)