Kacey Musgraves recently celebrated nine years since her hit “Pageant Material” song debuted. The track came from her hit album of the same name. For one of the songs on the album — “Are You Sure” — she called on famous friend Willie Nelson to sing on. There is a story of how the two connected to team up for the song — which Nelson originally released in 1965 — a story Musgraves recently opened up about in detail on social media. “It was 2014 and the first time I ever smoked with Willie,” she write on Instagram. “I was on the road opening for he and Alison Krauss, and he had us up on his bus f…