|CYBIL is a compositional language for the efficient specification of arbitrarily complex Csound scores. It is integrated into CECILIA and can be used to generate scores for any kind of Csound orchestra. The syntax of CYBIL owes to Leland Smith's SCORE language and, to an extent, to Heinrich Taub's Common-Music. Scores are specified as parameter lines with the help of a number of data generators such as sequences, masks, lines and exponentials. These generators can be further modified by the use of functions such as random, urns and constrained random and parameters cross-referencing.