`1 '3 .5 6# 8` Scale degrees

A bare number is a step of the current scale. ' raises it an octave, . lowers it, # and b alter it by a semitone.

Degrees wrap: 8 is the octave above 1, 0 is the seventh below it, and negative numbers keep going down.
Octave marks stack: ''1 is two octaves up, ..1 two down.
Change the key and every degree moves with it.

The scale, then the same degrees an octave down.

bpm 90
 
1 2 3 4 5 6 7 '1
.1 .2 .3 .4 .5 .6 .7 1

running…edit it and it re-runs as you type

c4 d4 e4 f4 g4 a4 b4 c5 c3 d3 e3 f3 g3 a3 b3 c4

bpm 90
 
assert 8 == '1
assert 0 == .7
assert -1 == .6
-1 0 1 2 3 4 5 6 7 8 9

running…edit it and it re-runs as you type

a3 b3 c4 d4 e4 f4 g4 a4 b4 c5 d5

bpm 90
 
..1 .1 1 '1 ''1

running…edit it and it re-runs as you type

c2 c3 c4 c5 c6

bpm 90
 
assert 4# == f#4
assert 7b == bb4
1 2 3 4# 5
1 3 5 7b '1

running…edit it and it re-runs as you type

c4 d4 e4 f#4 g4 c4 e4 g4 a#4 c5

bpm 90
 
key a3 min
 
1 2 3 4 5 6 7 '1

running…edit it and it re-runs as you type

a3 b3 c4 d4 e4 f4 g4 a4