On the eve of his album release, Kendrick Lamar stormed the streets of downtown L.A. for an impromptu free concert at L.A. LIVE. Posted atop a double-decker bus outside the Staples Center, the new king of the West Coast performed “Swimming Pools (Drank)” and “The Recipe” off his debut good kid, m.A.A.d city, as well as “HiiiPoWer” and “A.D.H.D” from Section.80.

Once word got out, a crowd began to take over the streets. Police cars and helicopters swarmed the scene and eventually cops cut off Kendrick’s mic and shut down the show.

“As the ghetto bird floats. 2chainz play in back of my head. They shut Downtown LA down. Due to the chaos of our celebration,” he tweeted. “An oh………..We just caused a RIOT, we just caused a RIOT!”

Luckily, the moment was captured by camera phone. Check out Kendrick’s surprise set below. [RapUp]