Gap has tapped Alanis Morissette, Joss Stone, Michelle Williams (of Destiny's Child), Keith Urban, and other well-known artists for its upcoming fall "Favorites" campaign. They will not only appear in ads, but will also contribute to a limited edition CD compilation

In the TV ads, each artist will perform a cover of their favorite song while at the same time wearing their favorite cut of Gap jeans. For example, Morissette, Stone, and Liz Phair will sing their versions of Seal's "Crazy," Irving Berlin's "Check To Cheek," and the Beach Boys' "God Only Knows."

Each of the songs and a director's cut of the commercial with behind-the-scenes footage will appear on the 8-track CD. It will be distributed at Gap stores and Gap.com, and from September 1st through September 17th the disc will be free for customers (wile supplies last) who make a purchase of $60 or more.

In the meantime, throughout August, the store will hand out free iTunes Music Store downloads to customers who try on a pair of their latest jeans styles during their "Find Your Favorite Fit" campaign.