Shocked from a live vocal mic - Part 2 Update

[Snowdog]

Thanks to everyone for your helpful comments. Quick recap..bass player gets
shocked on the lips by vocal mic while wearing his bass.

I pulled the three prong outlet from the wall that the bass player plugs
into...and sure enough, there are only two wires connected to the plug.
There is no grounding wire. I do see a ground terminal on the outlet to add
a ground wire. House was built in '56.

What are my options to add a ground? Can I connect a wire to the ground
terminal, run it down through the wall into the crawl space under the house
and stake it into the ground ( the earth)?

Thanks again.


Doug