Hey guys, I have a little bit of a problem. see there is this extremely old upright piano at a diner that i eat at almost every weekend. i play that piano all the time because the owner and everyone there is amazing and friendly and because we all know each other and it's basically the same people every weekend. ha! anyways, I was just wondering if there was a certain way you had to tune that kind of piano and if so how? I know you have to do each individual key and string. I also have a friend who has a tuning wrench but do you have to listen for a certain sound? or do you just make sure the