Why can't I use my credits to purchase a medley?

The medleys on the site are a combination of songs. For example, the Christmas Worship Medley is a combination of 4 songs. At $52.95 per orchestration, since these are almost all complete songs, that would be over $211 for the one song. However, in the medley, it is discounted to be only $59.95. Your credits are also a discount purchase program. If we then allowed you the extra 40% discount that your credits afford you, that would be a double discount, and unfair to the artist, the publisher and the arranger. As a result, the medleys on the site are not permitted to be purchased with credits.