Recording to test right and left channels...

I always use Take Five by Dave Brubeck you should hear the opening bit with cymbals coming out of the left channel.

Always easy to identify.

Here’s another burn in CD and they have a LP version, too.

https://www.amazon.com/Cardas-Acoustics-Irrational-Efficacious-Burn/dp/B00OY8UXME

+1 on the XLO disc.

If you're streaming search for something like "stereo test speaker setup"
One on tidal checks phase, frequency response, etc etc

Yes, like the tip "Take Five by Dave Brubeck".

Or if you prefer Adele track "send my love".
There she is saying "only the guitar thank you" in the left channel just before the track starts. (Another thing is that she is saying it in a rather low level so you can check that you have the resulution in your reproduction system or that the room is quiet enough, to be able to precive each word that she is saying.)
Good luck!