Susumu, Triumph have released a lot of great music. Their earlier releases are more aggressive and in-your-face compared to their more AOR-leaning stuff of the late 80's. A great album to start with is 'Allied Forces' from '81 which features the all-time classic, 'Magic Power'. 'Never Surrender' is great as well. 'Sport Of Kings' is where they veered more into an AOR direction. I also really like their early late 70's outputs when they mixed it up a bit more, alternating between straight up heavy rock and progressive-oriented songs. Either way, you really can't go wrong with Triumph (other than maybe their post-Rik Emett stuff) - great band with a great, diverse catalog.