This package is meant for content which you reuse regularly, like songs in small booklets. For example the booklets used at church, weddings or similar events. You typeset your content once (most likely a song), garnish it with some meta data and put it into a file. From there you can insert this content into your document with one single line. The inserted content can have header and footer that use the meta data (i.e., title, composer, lyricist). Inside these content fragments, you can combine an image of a stave line with song lyrics.