Org-babel-lilypond always renders full pages

[Oliver Heck]

Hi,

I am trying to use org-babel-lilypond and basically got it running. But 
somehow I always get full lilypond pages back instead of a small snippet.
This is what I have in my org-file:
#+NAME: Lilypond
#+BEGIN_SRC lilypond :file test.png
  \relative c'' { c d e f }
#+END_SRC


I read through the documentation on 
https://orgmode.org/worg/org-contrib/babel/languages/ob-doc-lilypond.html 
but cannot find a clue.

Any idea what I am doing wrong here?

Cheers,
Oliver