I sing in the accent I heard the song in, chameleon-like. If alone, I also oompa tink dink the instruments, since I recall them as well as the lyrics, in both senses, usually.

Although, I do recall singing train songs on a train ride and having my couchette-mate, an American friend (this was in West Africa) say that I was singing them in an Irish accent too - we had been singing Irish songs earlier. I denied it and didn't hear it myself even when pointed out, so I'm not sure if it was my unintention or his un-ear.

(Thread Creep) Odd little thing, I have remembered this train ride for years, and then got back in touch with a different friend from those days who turns out to have been the person on this train, NOT the mutual friend to whom I would have referred to above had this story predated the getting-back-in-touch. That is, he WASN'T a different friend, he was THAT friend, but I'd edited him out and photoshopped in someone else we both knew instead. With whom I *had* taken a different train ride... well, a different ride on that same train... and would never have realized I'd conflated the two if not for him recognizing my sister's last name in some random State Department email.

Dig the Internet even in little ways.