The Imperial has indeed has many hits goiing back to 1924 with ROSE MARIE. Other hits: OH, KAY! (1926), THE NEW MOON (192

, ON YOUR TOES (1936), LEAVE IT TO EM (193

, LOUISIANA PURCHASE (1940), ONE TOUCH OF VENUS (1943), ANNIE GET YOUR GUN (1946), CALL ME MADAM (1950), WISH YOU WERE HER (1952), THE MOST HAPPY FELLA (1956), JAMAICA (1957), OLICER! (1963), FIDDLER ON THE ROOF (1964), PIPPIN (1972), and DREAMGIRLS (1981.)
The 46th Street/Richard rodgers holds the records for the most Tony winners (including the revival of CHICAGO which opened there but had to move out to make way for the incoming STEEL PIER. CHICAGO moved to the Shubert and later the Ambassador.)
The Uris/Gershwin has been one of Broadway lest succesful theatres. Few shows until WICKED could sell it out. It had some minor hits with limited run revivals but it is an ugly building with a small marquee and awkward entrance. Similar to the Minskoff which has had some successful limited run revivals, transfers and concerts, but has never opened a full-fledged hit!
Cast albums are NOT "soundtracks."
Live theatre does not use a "soundtrack." If it did, it wouldn't be live theatre!
I host a weekly one-hour radio program featuring cast album selections as well as songs by cabaret, jazz and theatre artists. The program, FRONT ROW CENTRE is heard Sundays 9 to 10 am and also Saturdays from 8 to 9 am (eastern times) on www.proudfm.com