Yes, traditional musicians use concert pitch standard tuning. The person is daft! The question is: what is concert pitch for that place & time?! Thre are orchestras in the USA which are now tuning strongly sharp in order to sound "brighter." I have been playing & teaching guitar & other traditional musical instruments for many years--I tune to A=440! I tune my guitar to--better sit down for this: EADGBE!!!!! Golly gee, how could all those immigrants from all over the planet get together in the colonies or the wild west & play together? They must have tuned to the accepted pitch of the times. I even tune my Bodhran! I tuned my washtub bass after I got it--but that's another story.