Automatic Downloads to multiple devices

I am trying to get all of my devices on I cloud so that when I download music it downloads automatically on all devices; at least from the ipad to the itouch and vice versa.

I have check my settings both in itunes and on my Ipad and Itouch

Settings --> Store --> Automatic Downloads --< I only have Apps and Ibooks available to tick??

I have the latest updates... can ony one offer any sound advice?