credit spreads - country comparison

Guys, I have a quick question that i’m hoping one of the Fixed Income experts on this board can help with… I would like to do a comparative analysis across a time frame of a couple of years to show the widening and tightening of these spreads by geography. I’m trying to find a source that will provide credit spreads across multiple countries between AAA corporate and the requisite country risk free bonds (Treasuries etc). Anyone know of a good source for this type of info? Is this a feasible task to complete? A web search so far has not returned anything meaningful and so I’m hopping on a Bloomberg terminal tomorrow (for the first time) and will try to work my way through that (any help from bloomberg users would be a great help aswell). Thanks, JT