Artists to create more than 100 original mastertones.

Mobile phone manufacturer Motorola has teamed with Pepsi for a “Cool Tones” promotion that will feature more than 100 original master ringtones created by a variety of artists specifically for the effort.

The first participating star is Mariah Carey, who will write and produce 20 exclusive voice and music ringtones. She's also be tapped to kick off the marketing push through a series of national TV ads scheduled to air in May. Additionally, she will appear in an exclusive Pepsi Smash concert in June at Los Angeles’ Kodak Theater—the first stop if her summer tour.

Also included in the promotion is the chance to win a Motorola RAZR of SLVR phone.