What Do You Think Is the Most Legendary Concert in Missoula History?

I am not talking about the best show in the past five years, I mean the best concert to ever take place in the city of Missoula. What do you think should earn the title of the best? Missoula is a very music loving town, especially live music. It really doesn't even matter which day of the week a show lands on, if there is good music you can expect Missoulians to show up, and take it all in.