How’s this for a lawyer joke: King Charles I proves to be one of the worst kings in England’s history. Lawyers in Parliament orchestrate his trial for treason, leading to his beheading. Then, a few hundred years later, the whole sordid tale is turned into a musical called “Lament,” the CD for which is selling well on Amazon.com and which may become a stage or television production.

The punch line? The lyricist and playwright is Texas attorney C. Lee Cusenbary, 45, general counsel at San Antonio-based Mission Pharmacal, a 60-year-old privately held specialty pharmaceutical company.