Classic Country:
Vernon Dalhart - The Prisoner's Song, The Wreck of the Old 97
Jimmie Rodgers - Waitin for a Train, Desert Blues, Peach Pickin Time in Georgia
Gene Autry - That Silver Haired Daddy of Mine
Roy Rogers
The Sons of the Pioneers - Cool Water
The Light Crust Dough Boys
Ernest Tubb - Walkin the Floor Over You, Waltz Across Texas
Bob Wills - Right or Wrong, Away Out There
Jimmie Davis - You are My Sunshine, It Makes No Difference Now
The Delmore Brothers - Goin Back to the Blueridge Mountains
You must also never forget that Bluegrass is considered Country Music. Look up some of the older artists such as the Father of Bluegrass, Bill Monroe, Browns Ferry Four, The Dixon Brothers, and the Arthur Smith Trio.