New this week on AI DJ Lil Casey's Top 40 Countdown, Post Malone has a hit song called California Sober, a country western jam featuring Chris Stapleton off Post Malone's new F1 Trillion album. It's an album that also features a great collab between Post Malone and Billy Strings. Incidentally, Billy Strings released a different song called California Sober over a year ago with none other than Country Music legend, Willie Nelson. #californiasober #postmalone #chrisstapleton #willienelson #billystrings #aidj #lilcasey