I was at this concert. I was also part of a 60's rock group that played "Long Time Comin'" by the Montana band Initial Shock...as I remember it. Do you know anything about Initial Shock?Do you know of a newspaper report on the Yardbirds concert? They were only onstage for about 10 minutes. One of them collapsed and the others carried/drug him away. At least that's what I remember. How they ended up in Great Falls has always been a mystery to me. Truly great band.