“Amie,” “Two Lane Highway” and six decades of country-rock. There are songs that define a genre, and “Amie” is one of them. Pure Prairie League helped bring country-rock into the mainstream in the 1970s, building a catalog around rich harmonies, pedal steel, country songwriting and rock-and-roll muscle. Their multi-platinum album Bustin’ Out gave us “Amie,” while the band’s long history includes a notable chapter with Country Music Hall of Famer Vince Gill. Now in their sixth decade, Pure Prairie League are still touring and still making music, including their recent album Back on Track .