I was intrigued by your description of Mastery, "Instrumental thrash riffing marathons!" this made me think of Orion, Call of Ktulu, and To Live is To Die and I started drooling...
I checked out some of their song clips on amazon, and I really liked what I heard. They did sound pretty repetitive, but I don't mind that at all if it's really good. - Wow, I'm listening to a clip of "Power Race" right now, and it's goooood -
So does it get old or is it so good that you don't mind the repetitiveness?
I tend not to be bored by it on a full listen, and it also helps that the playing time is pretty short on Lethal Legacy. (their only release so far I think) It's basically an EP of 5 or 6 songs with some added demo versions of them tacked on.
Personally, I think it's a great sort of band for short car trips. Really powerful and driving, helps you speed.
