Upgrade Spendor A4 to D7.2?

My wife has suggested I upgrade our Spendor A4s to D7.2s. The last time anyone asked about Spendor A-line vs D-line in this forum was in 2019 before the 7.2's came out. We like the sound of the Rega/Spendor combination and want to stick with that 'British' sound.

The two instruments I'm looking for improvement in, are drums and piano. Drums sound kind of flat from the A4s despite Keith Moon's efforts to drive them hard. Although I suspect part of that might be my budget amp: Rega Elex-R.

There is nothing more I can do with the room (the rest of the details are on my virtual system) as it is the room we live in and my wife puts decor first.

My question is, what are your favourite test tracks for listening to drums - other than Keith Moon's drumming for The Who and the drum solo on Deep Purple's Made in Japan?

Also, what are the best test tracks for piano when evaluating speakers? I have multiple records by Keith Jarrett and own a parlour grand. I can hear the shortfall from the speakers but I want more than just Keith Jarrett for the comparison

I'm looking for tracks I can get to know well before heading to the dealer for an A/B comparison.

Thanks!!