It appears Post Malone is ready for the world to hear some of the country music he’s been working on in Nashville. The rapper took to social media on Thursday (Feb. 15) to share a clip of an unreleased track featuring Luke Combs. In the clip, Malone jams out while mouthing along to the lyrics to a brand new country song. The mellow melody is reminiscent of the carefree tracks found in both artists’ catalogs. The lyrics lend themselves to a sweeter time that both singers long for. Although he didn’t offer up any details, Malone did tag Combs in the caption alongside the clinking beer mugs emoji…