* prepare the environment

#+BEGIN_SRC sh
guix environment -l guix.scm
#+END_SRC

* build things

To render WAV files for all the songs:

#+BEGIN_SRC sh
make
#+END_SRC

To build the bass part for just “Circus”:

#+BEGIN_SRC sh
make 03-circus/parts/bass.pdf
#+END_SRC

To build a drum guide track with click:

#+BEGIN_SRC sh
make guide
#+END_SRC

When the environment variable =LILYPOND_USE_CHORDS= is set a simplified chord track is rendered for use as a drum guide.