Music is great! That's why you've got an iTunes library full of it. But who wants to spend more time finding a song in iTunes, and then waiting for it to end so you can find a new one, than actually enjoying your music?
With iQueue it's easy to select a song in iTunes and add it to your queue, a list of songs that will play in order automatically, without interrupting the currently playing song. You can rearrange your queue, delete from it, shuffle it, and even export it as a playlist to iTunes. But iQueue is more than just that. It's also a full-fledged iTunes controller, where you can play/pause, go back and forward in your library, toggle shuffle and repeat, control iTunes' volume, and rate the currently playing song. All of this is packed into an elegant little package.
