One of my favorite bands, don't know em for that long (actually I do, but I don't own their album for that long, have been tracking it down for a crazy long time). Possibly the best example of how Speed/Power/Thrash works.
https://www.youtube.com/watch?v=nvQGzZ95oVE&feature=channel_page
https://www.youtube.com/watch?v=mdvCGC8kZaQ&feature=channel
Am planning on uploading more songs but for the time being, these 3 will do.
Enjoy!!!