Typesetting Burlesque full.ly will generate a full score pulling all the bits and pieces in from the various other .ly files. As variations get typeset, uncomment the include and the corresponding variables within the score.
The half-random splitting into variations is defined in comments in Burlesque full.ly. The times are based on https://www.youtube.com/watch?v=y2sjRkDeD6c .
Each variation is in its own file, with one variable for each part. This should make it easy to mix and match parts/omitting variations/etc. in Burlesque full.ly. There is a score section at the bottom, handy for working on the variation separately. This section should be commented out when generating the full score.
Copy and rename var template.ly to create new var#.ly files