This, but (or "and") use the 4-row layout that dozens of tracker programs used[0], to fit over 2 octaves on the computer keyboard.

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 :)

[0] https://en.wikipedia.org/wiki/Music_tracker