CD as a product with each track as addittional

[panagiotiss]

Hi, as the title implies i want to be able to sell music cds(1 product) but at the same time to sell each track.
I can do it with different products BUT i need user to be able to choose either the cd or 1 or more tracks from the product details page.

e.g  CD costs 20$ add to cart

track1-->3$ add to cart
track2-->3$ add to cart

Any ideas

thanks