Couldn't find any classic country metal songs, but these are interesting to say the least.

Don Reno: https://youtu.be/WI-itxlwCHI?si=rIPpk_I2yKhkcf4g

Curly Ray Cline: https://youtu.be/lkh1ok_jswI?si=KRXBat0mIcv7e1PB

J. E. Mainer: https://youtu.be/9J1f8Xi3d7Q?si=XxUTSv2z9tXoq76Q