How to download purchased music to different device?
I'm relatively new to all this. I have a Nano, an older iPod Touch, and a recently bought iPhone5s. First, in "my music" on my computer, I can see the Nano & iPod but not the iPhone music. I also realized that I don't need music on the phone; just put it all on the iPod and eliminate contacts, notes, etc. Before this revelation, I bought some music which wound up on my iPhone. How the devil can I get it on the iPod & Nano? Also, there's music on the Nano & iPhone that I want to put on the iPod. This shouldn't be this difficult. I understand why some people have said in frustration, "So long Apple, hello new device..."
Any simple, non-jargon help would be deeply appreciated. I've been all through the iTunes and iPhone help pages and they're as helpful as warts.
Thanks.