Children Of Bodom, three times. (Not counting local bands) They were by far the best the third time around, but I was slowly getting tired of them at that point, so that was a bit of a shame. Seen Dark Tranquilty twice, they were always fucking great. Thinking about it, I've also seen Persuader atleast three times, but they kinda fall into the local band catagory. Nocturnal Rites too, but same thing there.