Amanda Stansbury did the research while earning her Ph.D. at St Andrews under Vincent Janik, the director of the Scottish Oceans Institute.
"What's new about this research is we taught the seals how to imitate new sounds," Stansbury said. "We could have played them any song or any combination of notes."
Stansbury said she worked with three juvenile gray seals: Zola, Janice and Gandalf.
To teach the seals, Stansbury said she first recorded the seals making their natural sounds. Then she played those sounds back to the seals.
https://www.npr.org/2019/06/23/735070681/a-new-hope-seal-learns-to-sing-star-wars-theme
That is not the Seal you were looking for...