I figured it was time to update my list and add some new stuff:
The Music Man - 2000 Broadway Revival (this is a better version than what I had previously listed)
Jesus Christ Superstar - 1996 London Revival
The Wiz - 2015 NBC LIVE! Production
Joseph and the Amazing Technicolor Dreamcoat - 2006 London Palladium Revival (this is a better version of the score than what I had previously listed, which seems to have been an 'off-brand' generic recording)
South Pacific - 2008 Broadway Revival
Dreamgirls - 2001 Concert Production
The Fantasticks - 2006 Off-Broadway Revival
Evita - 1996 Film Adaptation (although the 2006 London Revival score is a close second)
Chicago - 2002 Film Adaptation
How to Succeed in Business without Really Trying - 1995 Broadway Revival
The King and I - 2015 Broadway Revival
Oklahoma - 1979 Broadway Revival
Carousel - 1994 Broadway Revival
Also, if we can count "original recordings" as being the soundtrack albums of stuff that started out in film and was later adapted for the stage, the Broadway recordings of Beauty and the Beast, The Lion King, Tarzan, Newsies, The Little Mermaid all get votes from me, as does the Andrew Lloyd Webber adaptation of The Wizard of Oz.