Garryowen, MT was named after a march favored by the 7th Cav under Custer.
Were any other towns named after pieces of music?
There are several small towns in the US named Dixie, but I’m not sure which of them are named for the song. This site claims that Dixie, Washington, is named for the song.
The Sunshine Bridge, across the Mississippi River in Louisiana was named for the song “You Are My Sunshine”, which was written by Jimmie Davis, who served as governor of Louisiana. He was elected governor twice based on his national popularity as a country music star.
Wikipedia says Ben Bolt, Texas, was named after a character mentioned in a popular song:
:The town was laid out in 1904 by L. B. Collins. When he named the town, which is right down the road from Alice, he did so under the influence of a popular song, “Ben Bolt,” the first line of which is “Don’t you remember sweet Alice, Ben Bolt?” A post office was established at Ben Bolt in 1906.
