Sean Parker seems to have his eye on upstaging the iHeartRadio festival with a bash for its competitor Spotify, the digital music-streaming network in which he has invested. Parker hosted a party after the tech conference f8 in San Francisco Thursday with performances by The Killers and Snoop Dogg. Mark Zuckerberg left his own f8 party to attend Parker’s bash, and the Facebook brains spent time together backstage and in Snoop’s trailer before the rapper hit the stage. Andy Samberg also made a surprise appearance at the conference, where Parker admitted, “I owe a lot to Justin [Timberlake] … if he didn’t play me in a movie, I don’t think all these artists would … ever hang out with a bunch of nerds.”