"Modal" Transposition

[Pedro Kroger]

Hi All,

Is there a way to make a "modal" transposition? (not sure if "modal" is
the correct term)

I'd like to write something like 

pattern = \notes {b c e f} 

and then transpose \pattern a few times to get things like:

c d e g
d e f g
e f g a

and so on..

This sort of thing is very useful to typeset pattern-based exercises
for instance.

Pedro