Music City, n. — Green’s Dictionary of Slang

Music City n.

also Musical City

[the city’s association with country music]

(US) Nashville, Tennessee.

1975		L. Dills CB Slanguage 71: Music City/Musical City: Nashville, Tennessee.
2003		Chicago Sun-Times 20 Feb. 🌐 Eventually, he settled in Nashville, succumbing to Music City’s infamous songwriting infrastructure.