Of course: no one is going to be listening to tests, etc. BUT: it IS good to use these, to eliminate any variables, when making initial set-ups.
ie: On the Chesky sampler/test CD; David explains in detail, his position on the stage and distance from the mics, as he strikes a tambourine(Depth Test).
The LEDR test tells what to expect, if your system performs well, before each segment.
The Chesky CD contains a number of tests, in addition to the LEDR.
(https://www.audiocheck.net/audiotests_ledr.php)
and: (https://www.amazon.com/Chesky-Records-Sampler-Audiophile-Compact/dp/B000003GF3)
A Stereophile article, that explains the LEDR test: http://www.stereophile.com/features/772/