Back to the original question; I most often use "In Search of the Lost Chord", Moody Blues, Deram/London, DES 18017.
I bought it in 1969 (?) and after hundreds of playings it is my reference for "tone" adjustments. It is not the greatest for space, air, etc., but the boys had good ears for tone.
The first cut, "Departure", starts with low tones and moves to the highs very smoothly and is a good indicator of if I am close with VTA.
Cut three, "Doctor Livingston, I Presume, has some close vocal harmonies that I find revealing if I am "off."
The remainder of the album varies between passages that are complex (orchestral sound) and simple (single voice, the flute in cut 5, "Legend of a Mind" (Timothy Leary is Dead), etc.).
Plus, it matches most of my collection, which is comprised of non-audiophile, retail, LP's. When I am listening to some of my more recent purchases (200 gm reissues) I change the mat to a thicker one. This gets me very close without having to drag out the tool kit.
Best regards,
Dave