LOS ANGELES (Reuters) - "Weird Al" Yankovic, the parody singer and cult figure, on Wednesday earned his first No. 1 album on the weekly U.S. Billboard 200 album chart on the strength of several viral videos released online. Parodying pop hits such as Pharrell's "Happy" ("Tacky") and Lorde's "Royals" ("Foil"), Yankovic's "Mandatory Fun" album sold 104,000 copies in its debut week, according to figures compiled by Nielsen SoundScan. Billboard said it is the first comedy album to top the chart since 1963, adding that "Mandatory Fun" had the most weekly sales for a comedy album since 1994. Yankovic, who has scored hits over the past 30 years with parodies such as "Like a Surgeon"(Madonna's "Like a Virgin") and "Amish Paradise" (Coolio's "Gangsta's Paradise") launched a promotional campaign releasing eight new music videos in as many days.