Hi, Tucker. There are two different songs, the Ian and Sylvia one and the one shown in the linked thread, which is a calypso song that was popular in maybe the late 50's? I suspect John's parents want the calypso song, but maybe not.

The full words to the Ian and Sylvia song are in the database under the title, "Fare Thee Well Marianne". I searched for "lobster" and got several songs, including one -- NOT the one you mention -- called "Mary Ann" which was apparently a parody and had a line or two that didn't scan. Just look for "Fare Thee Well Marianne."