...you keep a full-scale pitch pipe in your car so that you can try out singing a new song until you get the right key.

...you look forward to long car trips (I have responsibilities around the state in my job) in order to work on vocals.

...instead of going "out on the town" when you travel, you bring pizza and beer back to your motel room (and your guitar) so you can go over more tunes.

- Merritt