Yes, of course. The claim that all keys sound the same is neither objectively nor subjectively true. Objectively, the root notes are at different frequencies, a

Yes, of course. The claim that all keys sound the same is neither objectively nor subjectively true. Objectively, the root notes are at different frequencies, and the other notes similarly feature a unique combination of frequencies. Subjectively, I - and I presume many others - get a particular feel even from individual notes, and when I compose something I often start by picking a root note that suits what I want, and then choose the key based on that. Otherwise why have keys in the first place? I’ve had conversations with other musicians about what particular key we’re into lately, for instance, for a long time I’ve really enjoyed Bb minor.