RHCP’s Chad Smith played drums on two tracks during Post Malone’s Bud Light Seltzer Session on New Year’s Eve. You can see Chad play from about 34.50 to the end. The RHCP drummer plays on a cover of ‘Rooster’ by Alice In Chains and then on Black Sabbath’s ‘War Pigs’ (sounds beyond amazing!) which also features Slash. Andrew Watt is also involved.