[samatman]

Use pentatonics! Most other choices will sound poor.

How would you render (do (blah bler) (bip bop)) to make it different from (do (blah bler bip bop))? Emphasis?

[zersiax]

I actually had to go through that line by line to even see the difference since as I said I tend to ignore braces, brackets and parens unless I need them. For this, working with audio only would just be a bad idea and braille display would make this a lot easier

[socksy]

Pentatonics is a good idea. Maybe to distinguish in this case you might have a 'blip' type noise go down to the sound of the do block's tone?