This is a fabulous brand new music just released on the App Store today – a worthy winner of our accolade of Our App of the Day. Seamless lets you transition from playing music on your Mac to playing music on your iPhone or iPod touch — or vice versa — in a single tap. It’s 9AM, and you’re at home getting dressed to go to work. You’ve got iTunes open, and "Back in Black" is playing. You’re totally into it, rocking out with your air-guitar, but you’ve got to go to work now. So you obviously want to keep listening to it on your way. So you pause iTunes,…