\header{
filename = "preludes-2.ly";
title = "2";
+opus = "BWV 939";
+% blz 10
+%
+% Six Petits Pr'eludes
+% Collection Johann Peter Kellner
+% ca 1703 - 1707
composer = "Johann Sebastian Bach (1685-1750)";
enteredby = "jcn";
copyright = "public domain";