That song stumped a friend of mine
Back in the early 70s, my roommate (Mike) and I were in our early 20s. He had been a DJ at a small town station, when he was about 18, that played rock-n- roll and folk music so he was familiar with all the songs from the mid-50s to the late 60s. We used to try and stump each other by giving the title of the song and the other person would have to either name the singer/group or sing part of the song. He was very good at that game so when I heard MTA on the radio I knew I had him.
I asked him who sang MTS and he couldn't answer the question. After about an hour thinking about it he admitted he didn't know. When I told him it was The Kingston Trio he said it must have been the B-side of their record so it didn't count. I wouldn't let him off the hook that easy so Mike contacted a DJ in the San Diego region, where we lived, and asked him about the song MTA. The DJ told Mike that was one of The Kingston Trio's biggest hits and that no, it wasn't the B-side of their record.
What really put icing on the game was when he lived with his parents in Coronado, the house they were renting was previously where one of The Kingston Trio had lived.