The user picks a style of music to compose within. Then short instrumental and vocal loops are available to add to the accompaniment. The graphics are a bit outdated looking, and some of the loops are lame, but the Blues one is fun.
Users are aware of the chord progressions that they are working with. They are not preset progressions. There is a great amount of creativity and independence in this program. This program can be used to kick start a compostion project.