Our singer is sick, very sick, but the dude has sucked it up and played 3 gigs in the last week. We played our last one last night. He has a severe head cold, his voice is shot, and he can't hear unless he's right in front of a monitor and a guitar, or bass amp. He can't hear the key, especially when songs start. He sucked it up and played all 3 gigs though. Can't knock him... He did his best. Last night he got lost in the middle of a very simple 3 chord beach music tune. Just completely wandered off the reservation. I can hear him through my monitor, I know where he's at in the song, so I looked around and made the change to be on the same chord and in time with him. The drummer got it, the guitar player got it, but the keyboard player went bat poop crazy. He's right beside me, and he stops playing and starts yelling at me, "What the hell are you doing?!" And then he rambled on about me f'ing up the song. Normally I wouldn't change the arrangement because singers can hear when they're off-key, out of time, or whatever. But our guy couldn't hear. The second reason I changed is because it's a simple arrangement and chord progression. We're not playing Rush tunes... So was I right, wrong, whatever? It worked, the song got back on track, and no lives were lost.