I play electric guitar and today I had an experience where the guitar would give very slight tingling sensations - I wouldn't quite call any of them a bad shock because none of them really hurt badly, but it was noticeable.
My question is: how to I test if the outlet we use is grounded properly. My bassist who uses the same power strip also said he gets little shocks from his bass. We play at football games and we are on those metal bleachers doing pep band crap which requires us to use an extension cord that connects to a power strip - everything that is connected is three prong including the amps.
Is this a situation where it's dangerous enough that I shouldn't plug in again until I know the reason why and fix it?