In the mid to late 60s it wasn't uncommon at all to see a huge reel-to-reel sitting on a table right behind the lead singer. It had all those outer space sounds many records had on them. No way any band could recreate those sounds, so they just played the tape when it was time for the tape. Didn't ruin the show for me, but that was in the day of no monitors and guitar cabs being used for PAs. You just did what ya' had to do.
It was the worst feeling and most weird experience I've ever had music wise...