Many moons ago I deselected many songs in my iTunes library by unchecking the boxes next to the song title. I would like to get them all selected again but cannot figure out a way to do it unless I go song by song and check each one again. Does anyone know if there is an easier way to do this (re-check all songs)?

Also, in the new iTunes, when you use the genius mixes, 12 show up on my computer screen in iTunes but only 9 show on the iPhone 3GS screen. Reason?

Thanks for your help!