@Rubens thanks for this comment, it's super helpful!!
Rubens I would not want them to compete with the piano which is the centerpiece of that room.
I had not been thinking of it this way... Hmm, I will definitely think more about this. Even if I ultimately end up with some massive print there, it's helpful to think about it this way so I make an informed choice.
Re this:
Rubens I would rather go with a group of small frames
I have several smaller prints (like, 8" x 10' or something) that I specifically don't want to put on that wall, because you can't really see the artwork. Like these:
These were on the wall in the piano room at my old house (for reference, they're not exactly 8" x 10" but close), but the room was oriented differently, and you could walk right up to the wall and look at the up close if you wanted to. I feel like artwork this size would be wasted on the far side of the piano because you couldn't really see it well.
But back to your original point... the large set of three pieces (B&W) definitely becomes the centerpiece of the room. Whether one thinks that detracts from the piano or adds to it is a separate question, but it's very bold...
The colorful print with the rounded shapes maybe is less overpowering... Also, I think I can select the size, so I could get a size that's somewhat smaller than what I showed in the mock-up... That would also leave room to add more on the sides if I wanted to in the future...