No matter what tubes you choose for this amp, it sounds amazingly good. I use this amp wherever getting loud will not create a problem. Everything sounds great through it. This amp suits all styles well, but I do caution that it is very loud. Although I play most styles of music, I choose this amp for classic rock and blues voicings.
Jazz sounds great through it, too, though.
Country is a given. Distortion is mostly a function of what pedals you use and how you have it tubed. I wouldn't hesitate to depend on this amp to be nothing short of a world-class road star made of the finest components and construction quality available in the industry today. For the several months I've had it, i've had no problems. Dealing with Clark Amplification has been a treat.