This card set has many parts and is intended to go along with the Story of the Orchestra book written by Robert Levine. The book and music should be introduced to the children first. After that, the book and music can be used with the instrument picture cards to identify the different instruments playing during each track. Secondly, the composers can be shown to the children so that they can learn who wrote what songs.
The track number listings are for the children to work on this on their own. They can lay out what track they are listening to (probably using head phones), with the composer and instrument(s) underneath.