Andrew Watt – production mastermind behind Ozzy Osbourne's latest album, Ordinary Man – marked his recent 30th birthday by hosting a star-studded jam session with Post Malone, Metallica's Rob Trujillo, Foo Fighters' Taylor Hawkins, Red Hot Chili Peppers' Chad Smith and Jane's Addiction bassist Chris Chaney.
A series of photos posted to Watt's Instagram page includes one of him and Malone seemingly having a head-to-head shred battle, with both offering their best Hendrix-style behind-the-head playing in front of a number of Orange amps.