YouTube is rumored to be gearing up to launch a subscription-based music streaming service. The video-streaming juggernaut is hoping to become a fully-fledged media juggernaut in the future it seems. The service is said to have a free model which allows users to listen to all the music they'd like, but with ads popping up from time to time. It's no different than when ads pop-up before/while you're watching your favorite YouTube videos. A paid subscription would of course remove the ads for an uninterrupted music-listening experience.