Teen starlet Theresa (real name Theresa Rosenius) was a true one-hit wonder. I don't know if she ever cut but this one single. But the A-side of that single (in 1965) "Menolippu" has assured her a place in Finnish pop history. The original was Neil Sedaka's lesser known recording "One Way Ticket (To The Blues)" from the year 1959. Many of us probably remember the disco version by Eruption in 1979.
Here's the pair: