When William Shatner had pursued a career in music, he had been famous there for his spoken-word versions of songs like Elton John's "Rocket Man (I Think It's Going to Be a Long, Long Time)" and Queen's "Bohemian Rhapsody."
But... I can't help wonder if he could've done a spoken-word version of Saga's 1980 cult hit "Don't Be Late (Chapter 2)"? Saga, if you all should know, is a progressive-rock band from Canada, which is also Shatner's home country.
However, while they were extremely popular outside of their homeland (they were very big in Germany and other European countries), their only real U.S. hit was "On the Loose."
He could also have done a spoken-word cover of Rush's "Tom Sawyer." Rush is a prog-rock band also from Canada.