Re: (doc help) scheme: why not start with define-music-function ?

[Mats Bengtsson]

A related question, how do you define a music function that takes
a string or a markup as an argument?

For the documentation, we should include a list of predicates (is this 
the correct term) to use to specify the
argument type for all commonly occuring arguments, including:

Music expression - ly:music?
Integer argument - integer?
Markup           - markup?
Text string      - string?
Scheme symbol    - symbol?
...


  /Mats