So much great info here to digest!
I'm having some trouble finding laptops that will support dual drives, other than the Clevo ones that @Lord Tim suggested. Since I'm in the US, that doesn't seem to be an option.
I'm not too concerned about the USB ports. The USB 3 ports are backward compatible, so that shouldn't really be an issue. I figure I'll need three at most, which most of the ones I've looked at have, if you include the C ports. But, it is a good point to not forget to make sure that they are there. It is something that could be easy to forget to check.
I was not very familiar with the TDP rating of CPUs. I read up on it a bit, and I guess that it can be used to see how powerful the CPU is. I haven't seen any laptop makers list the TDP ratings, but it seems that Intel lists it on the ark.intel.com specs page for the processors, so it's a bit of a pain to get it, but it's out there.
I was really hoping to get 2-in-1 laptop/tablet like a Lenovo Yoga, mostly because it seems that it would be easier to integrate into the drum kit, not to mention look cool. It doesn't seem that would be a good choice, though. Their CPUs all seem to have a TDP rating of 15W.
Thanks for all of the tips. I feel much better informed now and can make a better choice.