24k Goldn has mined some precious metal in “Mood.” The San Francisco rapper’s breakout single is a global hit, hitting the top spot on sales charts in the U.S., U.K., Australia and elsewhere. All this at age 19. On Monday, the MC visited Jimmy Kimmel Live for an energetic performance of his hit, along with collaborator Iann Dior and a full band in support. “Mood”, released via Columbia Records, is the first Billboard Hot 100 No. 1 for both 24k Goldn and Dior. It just snagged a second week at the chart summit.