Spoilers are precisely defined here. Rules vary by the story's medium. Info from television stories can't be added here until after the top or bottom of the hour, British time, closest to the end credits roll on BBC One. Therefore, fans in the Americas who are sensitive to spoilers should avoid Tardis on Sundays until they've seen the episode.
Lorenzo met the Doctor in 1935, on a boat sailing across the oceans of Earth. He owned a violin, which he allowed the Doctor to play. The Doctor played the violin non-stop for nine hours, causing Lorenzo to become angry, and he took the violin back from him.