Exactly. We all have different ways. Some are better at accents than others. I was once asked by a Cambridge-based drama festival invigilator if I came from the north of England when I played Harold Gorringe in Peter Shaffer's Black Comedy with a Liverpool accent; after which he awarded me the Best Actor cup. And when I played an American reporter in Noel Coward's Relative Values for the Shelford [Cambs] Drama Circle, one of my co-members who had brought American guests to watch it, told me afterwards that one of them had said "You were lucky to have a real American to play that part". In fact I come from North London [Hampstead/Hendon] originally. So I think I can claim to be good at some accents at least. See my youtube channel

http://www.youtube.com/user/mgmyer

where there are various American, Scottish &c songs, to see if you agree. And note that I only use any sort of accent other than my own when it seems to me appropriate to the song. There would for instance imo be no point in singing "I'm Bound to Follow the Longhorn Cows" in other than an American accent.

≈M≈