MOG is a social networking site for people obsessed with music. In addition to connecting users with similar music tastes, they can create blog posts and manage their own profile pages. The site recently launched MOG All-Access which provides (for $5 per month) unlimited artist radio and on-demand listening (choosing any song you want at any time).
After searching for and selecting an artist or song, the music player launches containing one of the best features of the MOG user experience - a slider control that lets users narrow or expand the variety of an artist radio station. Initially, the slider is positioned all the way to the left playing only songs by that artist but, by moving the slider to the right, it incrementally increases the amount of similar artists in the queue. It works really well and gives users effecient control over their music while letting them also discover new artists.