Warner Bros. 50's titles (theatrically distributed) believed to have been released in 4-Track stereo :
1) "THE COMMAND" (1954) (Warner archive 1.0 mono, IMDB theatrical 4-Track Stereo)
2) "A STAR IS BORN" (1954) (Blu-Ray available 5.1)
3) "LUCKY ME" (1954) (Warner archive 5.1)
4) "KING RICHARD...
The story goes that copies of 4-track stereo prints of some 50's Warner titles ended up at the Library of Congress at the time of release. That is how we were able to get "Rebel" and "Eden" in 4-track.
A 2-track stereo mix-down (Sea Chase) was made for the laserdisc ( and VHS??)from the 4-track...