So I am a newbie regarding music theory and time signatures. What is the easiest way to learn what time sig a song is in?
Aside from looking at reliable sheet music or transcriptions....
The way I learned is by listening to a lot of bands that used "odd" time signatures commonly. Of course, you have to have an understanding what a time signature is and signifies. You also start from the premise that 90-95% of all popular/rock music is in 4/4 or 3/4 or some variant thereof (e.g., 12/8, 6/8 or 2/4).
On a side note, my 15 year old flute/piccolo player will be taking AP music theory in school next year. I'm probably looking forward to it as much as she is!
My wife is a flute/piccolo player! I had so much fun when she was in school studying music theory.
The thing of it is that my daughter has always looked to me for theory-related information, but I'm mostly self-taught. I learned a little bit of theory playing trumpet in elementary and one year of high school, and the woman from whom I took lessons why I started playing bass more than 30 years ago included some theory instruction, and I took a one semester class in college. But I never learned advanced theory. I have feeling, though, that when she gets done with the class, she'll be ahead of me.