[plt-scheme] code organization question

From: Stephen Tetley (rt014i7347 at blueyonder.co.uk)
Date: Mon Oct 17 16:58:19 EDT 2005

Yoav Goldberg wrote:

>(The code is a library for musical objects.)
>I have a type "sound", which is a collection of sound-related things.
>It can be partially specified (ie have some missing elements), and is
>constructed with a keywords like syntax:
>(make-sound 'pitch: (make-pitch '(B b) 4) 'duration:
>(make-duration-from-wholes 1/4))
.Hello Yoav

I don't have an answer to your actual question but you might find it 
useful to look at Roger Dannenberg's Canon Score Language and Stephen 
Travis Pope's Mode, which also use labelled arguments for short hand for 
note description (papers are available from the author's respective home 

Roger B. Dannenberg

Stephen Travis Pope

I've been trying to do something similar in Haskell, and at least for 
users (rather than other developers wanting to make extended sound or 
note types), the shortest shorthand I've come up with is quoted strings 
in ABC notation and a parser for them. For Haskell this has the 
unfortunate problem of delegating type checking to runtime, but using 
proper constructors makes note descriptions very long even with 
defaults. Maybe Scheme macros could get help around some of the 
'unseemliness' of quoted strings.

As for developers - if you are proposing differing representations of 
the note/sound type, you might want to check [1] - for my undergraduate 
thesis a few years ago I used the techniques described in this paper to 
make a score language in MzScheme that could handle both MIDI and Cmix's 
Minc as note representations.

Best wishes 


[1] ICFP 98 Findler and Flatt
Modular Object-Oriented Programming with Units and Mixins

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