And also, I think it is possible to sing a song in dialect using your own accent. Your "accent" is different from dialect. Edric Connor, the actor and singer who sang the Jamaican folk song "Day-O/Day Dah Light" (better known in the Harry Belafonte/Irving Burgie version, which standardises the text) and other Jamaican folk songs on an album (LP originally, now CD), called "Songs from Jamaica" in Jamaican dialect, yet because of his accent, he sounds quite different to a Jamaican singing these songs.