I like the Proclaimers doing anything! I love the way they don't try to hide their Scottish accents (most Scottish 'pop' singers sound just as 'American' as their English and American counterparts, IMHO).

I try very hard not to do the mid-Atlantic thing on songs I've learned from North American artists' recordings, but it occasionally inadvertently slips through, I guess for the reasons I gave above. I steer well clear of Scottish stuff - my 'Scottish' accent sounds more like Scouse!