"LaRCS" stands for "Live and Record Combined Stereo", which means that on the left side you can hear a live performance, while on the right side the video clip/studio version.
In this case you can enjoy the "Boogie Woogie Bugle Boy" from the Andrews Sisters. On the right side you can find the movie clip version (tempo adjusted), while on the left side a studio environment recording from 1941. Still I regard it as a live performance, because it was taken in a single piece.

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