Music function returning *unspecified*

[Dan Eble]

Are there any potential drawbacks to allowing music functions to return 
*unspecified* and having the infrastructure map it to (make-music 'Music)?

The main advantage is that something like
    (if condition
        (begin
         ...
         ...)
        (make-music 'Music))

could instead be written

    (when condition
      ...
      ...)

I believe that this can be done; I'm asking whether there is any reason 
that it shouldn't be done.

Thanks,
--
Dan