I can't remember if they changed it right before they got on stage, but in Trezzo a sort of Best of from Kiss was playing before the show. I remember
I stole your love
Shout it out loud
Probabily Love gun, Christine sixteen and Strutter
And many others, can't remember what was played after.
I can remember that the two shows from the HBM tour I attended had the same opening theme. It sounded something like classical Music, with violin as a main instrunent. I know it because in Pordenone I heard that melody, and in Segrate I switched on my portable recorder as soon as that piece kicked in since I recognized it. AND if I'm not wrong, after the Segrate show Deuce by Kiss kicked in (have to listen to the record to be sure, I'll let you know asap)
Oh, does any italian fan know what was played before the 2012 Bloom concert? I remember a sort of super cool, long, growing jam getting louder and louder before the show