I have a tape of the first national telecast (1967) which runs 90 min. and features one sponsor - an airline - in one 60" spot per break. They do long nuumbers from CABARET. APPLE TREE, WALKING HAPPY and I DO DO I DO. ALl that plus all the awarads...not one speech lasts more than about 20 seconds.
1971 was their 25th anniversary when they did numbers from Tony winning shows of the past 25 years. (A lot of these bits are in LOST TREASURES.) So, no time for numbers from nominees that year.
1972 they did numbers from AIN'T SUPPOSED TO DIE A NATURAL DEATH, GREASE and JC SUPERSTAR plus the two big dance numbers from the previous season's NO NO NANETET. Nothing from FOLLIES!!
1973 they did numbers from Internationsl staginsg of musicals...KING & I in Japanese, SHOW BOAT in London (Cleo Laine), an italian musical called CIAO RUDY among others. Nothing from NIGHT MUSIC or any nominees.
I think they finally got back to doing songs from each nominee in 1976 (A CHORUS LINE, CHICAGO and PACIFIC OVERTURES all had numbesr on the air.)
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