This is a link to a WHAT HI*FI article entitled "10 of the best songs to test your speakers" from October last year.  The tracks suggested therein may cause anything from derision to delight; perhaps you have some of the tracks in your arsenal and use them already...or don't.  There is not just the one article though, at the bottom is a list of further links:

10 of the best tracks for testing treble
10 of 2018's best albums to test your speakers
10 of the best tracks to test your headphones
12 of the best vinyl test records
12 great jazz recordings to test your hi-fi system
15 hi-res album downloads to treat your hi-fi system
15 of the best piano tracks to test your system
18 songs that sound their best on vinyl
19 of the best tracks for testing dynamics, rhythm and timing
21 of the best vocal tracks to test your system
25 of the best tracks for testing bass
50 of the best hi-fi albums for audiophiles

I know in what high regard magazines like WHAT HI*FI are held among the hifi cognoscenti and knew you chaps would appreciate the pointers the above articles give.

There's plenty there to start many an argument so... off you go.