When Milk Music first came on the scene, it was noteworthy for offering a free listening experience without any ads. The company told TheNextWeb that the addition of a paid tier isn’t changing that; both plans will continue to be ad-free. Despite this insistence, it seems the days of no advertising could be numbered. On the Milk Music website, the ad-free claim is marked by an asterisk that adds “For a limited time” to the statement. It seems likely that the addition of a paid tier is the first step to turning around the service’s business model, but we’ll have to wait and see if the other shoe does drop.