I am awaiting the arrival of a MacBook Air and with the limited space I would like my iTunes on an external harddrive and I have a couple of questions: - I want to use the Time Machine backup of my current iMac. I obviously wouldn't want to transfer over my iTunes folder on to the Air. Am I able to deselect that? - Would it be best to transfer it from my iMac on to an external HDD then run it from there? - What would I need to get in order to have an HDD plugged in to something (router?) so I could access it my iTunes documents from there? Would this be slow to play etc?