The track listed as "Overture" on the CD is not an Overture, but rather an introducion. (The full Overture can be heard on RCA's cast album of the 1977 revival with Yul Brynner.)
The Curtain rose showing the ship pulling into port and the reaction of the natives. That is what you hear re-created on the disc.
The director (Christopher Renshaw) is another in a long line of conteporary know-it-all directors who know nothing about classic musicals and seem to actually disdain them. He decided faily early on not to waste time with a 5-minute Overture, and the R & H office let him get away with it.
Modern directors seem to hate Overtures arguing that no one listens to them (neglecting the fact that the Overture was designed to quiet the audience and usher them into the world of the musical being presented.) I doubt audiences ever sat and listened the way one would listen to a symphony orchestra, but that does not excuse cutting them all together.
Nor do we need stage business as Arthur Lauren needlessly addded to the 1989 Tyne Daley GYPSY. Even the 2003 revival of OKLAHOMA! added visuals to an abridged version of that famous Overture.
So what you are left with on THE KING AND I disc is the opening bars of the original Overture segued into musical underscoring for the opening scene.
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