In an hour it will be time to take my three year old to a new session of her kiddie music class, and even as I pretend it isn't a big deal, I am stressed about what to put on my head. We last went to these classes 4 or 5 months ago, and then I wore my wig. Indeed the music class, a gathering of mostly mommies and their toddlers, was my personal testing grounds for a wig as part of my identity. It was not, however, an ideal environment for wig wearing. Dancing around with a two year old's…