I call "not a one-hit wonder" on Triumph. While Magic Power was their most famous single, it was not the only successful one.
In addition to Magic Power, I have Hold On on my Blackberry.
And, interestingly enough, while looking for that link, I found a great recent acoustic version of Magic Power that Rik Emmet did not too long ago (I think this is how he performs it now):
Ok another strange one for you. Not really a one hit wonder, no hits really, BUT very talanted artist, Mike Oldfield. You HAVE heard his music, but you may not know where. You heard it at the movies most likely, or sampled by your favorite rap artist. His most well known work was used in the Excorcist.....