Apple has released the iTunes 12.1 for OS X Yosemite, which introduces a new iTunes control widget for Notification Center. Using the widget, users can see which song is currently playing and pause, skip, or favorite a track. If you regularly use the Mini Player you'll already be familiar with the controls. When listening to iTunes Radio, users will also be able to purchase songs that come up directly from Notification Center.
The update also improves performance when syncing between your iOS devices and computer. You can find iTunes 12.1 right now in the App Store.