iTunes US Account

ok know there threads making account have more specific question. have irish itunes account , made account. want know if start using 1 music on library still sync devices (even though there content 2 different accounts?).
want buy itunes vouchers, sellers on ebay guys recommend?
in advance!

 

the music part work

ebay sellers? expensive, have familiy/friends - met online on forum or whatever

 

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