Here's how you can create a new genius playlist in iTunes 11 with one click.
1. Open the iTunes application.
2. Play the song you want to hear.
3. Click the arrow icon next to the track name.
4. Up Next will set up a Genius playlist.
5. Click the Up Next option to the right of the track that is playing to see your list.
For more, see the original article at the link below.
The Ultimate List Of iTunes 11 Tips, Tricks And Changes | Cult of Mac