On a US keyboard:
QWERTYUIOP[] is the white keys starting at middle C. (The row above is the black keys; the 2 key plays C#.)
ZXCVBNM,./ is the white keys starting an octave lower. (S plays a low C#.)
The two ranges overlap; e.g. Q and , both play C in the same octave.
Grew up composing music on a computer this way when my (musical) keyboard didn't have MIDI and I couldn't afford a better one :)
But if FL Studio (formerly FruityLoops) and Renoise use the same layout, as others have said, then those are probably going to resonate with a wider modern audience :D Or maybe just call it "FL Studio / Renoise / tracker layout"?
I don't do computer keyboard note entry any more, but I still have the muscle memory for that 4-row layout from hours spent with it in the late 90s :D And I'd totally use it in your game. (My MIDI keyboards are kinda too far away from the mouse and monitor.)
White Keys: The keys from ‘A’ to ‘L’ on your keyboard correspond to the white keys on a piano, covering a full octave from C to D. Black Keys: The keys in between, like ‘W’ and ‘E’, correspond to the black keys or the sharp notes on a piano. from : https://www.electrikjam.com/use-your-keyboard-as-a-midi-cont...