Numering for exercises

[Charles Gran]

I'm looking for a way to number short rhythms and melodies on 
practice sheets for an ear training class I'm teaching.  The example 
below looks how I want it, but I am wondering if there is some way to 
have the exercises numbered automatically.

\version "2.10.33"

#(set-default-paper-size "letter")

\score {
\new RhythmicStaff {
\time 4/4
\set Staff.instrumentName = "1 "
b'2 b
r4 b r b
b r b r
b2 r4 b
\bar "|."
}
}

\score {
\new RhythmicStaff {
\time 4/4
\set Staff.instrumentName = "2 "
b'2. b4
r4 b8 b r4 b
b r b r
b2 r4 b
\bar "|."
}
}

The above is what I want, but it would be great if there was some way 
to have the exercises numbered automatically.  Is there?

Charles

p.s. For anyone who's interested, these are the relevant threads I 
found for making exercises in lilpond:
http://lists.gnu.org/archive/html/lilypond-user/2006-03/msg00285.html
http://lists.gnu.org/archive/html/lilypond-user/2006-11/msg00458.html
http://lists.gnu.org/archive/html/lilypond-user/2007-06/msg00396.html


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