“Don Henley was country before it was cool, long before he was a singing, drumming and songwriting member of the Eagles. Cass County, his first solo album in 15 years, is named after the East Texas plains where Henley, now 68, grew up amid farming, oil rigs and the Southern radio crossfire of blues, gospel and honky-tonk music that produced rock & roll. Henley alludes to those roots and ideals in h”