I have an old windows based laptop that I have downloaded a bunch of music on using my account, and we recently bought a MacBook pro which my girlfriend has been using with her iTunes account. When I put all my music onto the MacBook, it asks me to authorised the computer for those songs that were bought under my iTunes account. We want to get rid of the laptop but is it ok to have music in a combined library that has come from 2 different accounts and will then be sync'd to different iPads, iPods and iPhones? Will the 2 accounts become an issue when syncing etc?