Via Billboard Magazine:
After more than 30 years on the charts, comedian-singer “Weird Al” Yankovic earns his first No. 1 album on the Billboard 200, as “Mandatory Fun” debuts atop the list. The album is the first comedy set to top the chart since 1963, and logs the largest sales week for a comedy album since 1994. “Mandatory Fun” was released July 15 through Way Moby and RCA Records, and sold 104,000 copies in the week ending July 20, according to Nielsen SoundScan. It was promoted by a well-received daily viral video campaign that launched Monday, July 14. Starting with his parody of Pharrell’s “Happy,” Yankovic released eight music videos for the album through the week on various sites, like The Wall Street Journal, Yahoo, Nerdist, College Humor and YouTube.
The last comedy album to hit #1 was 1963’s My Son, The Nut by Allen Sherman. Steve Martin nearly got there in 1978 when Wild And Crazy Guy peaked at #2.