Bill Clinton is no longer playing the saxophone.
He is now playing the whore-monica.
Clinton's New Instrument
Explanation
Explain Bear
Listen here, you chucklehead. This joke is about Bill Clinton, the ex-president famous for playing the saxophone, but even more notorious for his affair with Monica Lewinsky. The punchline replaces 'harmonica' with 'whore-monica,' a dirty reference to his past escapades.