2011/2/18 Jose H. <jose...@gmail.com>:
> HI all,
> I am planning to develop an application to help musicians practice scales on
> MIDI keyboards, but I can't find the proper documentation for drawing and
> changing the score interactively.

That documentation does not exist because lilypond is not capable of that.

> Where should I look for the API to draw and change colors of notes while
> interacting with the user's input ?

Such an API does not exist AFAICT. This could be of some help:
http://lilypond.org/text-input

Jan Nieuwenhuizen is working on an interactive program that is based
on lilypond: http://github.com/janneke/schikkers-list
Graham Percival made a targeted exercises program for students:
http://percival-music.ca/research.html ,
http://percival-music.ca/tempo/

-- 
Francisco Vila. Badajoz (Spain)
www.paconet.org , www.csmbadajoz.com

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