Have Billie Joe Armstrong and Brian Molko met?

Yes, Billie Joe Armstrong and Brian Molko have met. In 2001, Armstrong and his band Green Day performed with Molko's band Placebo at the Reading and Leeds Festivals. The two musicians also met at the 2002 MTV Video Music Awards, where they were both nominated for awards. In 2004, Armstrong and Molko collaborated on the song "The World as a Garden" for the AIDS charity album "46664: Rise Against AIDS."