Me: "Playing the guitar. I just love this instrument so much. It's simplicity brings music to the masses. Every note rings 'Hey! You do not need expensive classes or fancy instruments to enjoy music!'"
MSB: "Well anyone will suck as a musician without proper music theory training."
Me: "So Jimi Hendrix, the Beatles, the Clash, Nirvana, and nearly every multi-platinum selling artists failed as musicians because they did not have any music training?"
Me: "And these chords that I am playing with the basic knowledge, regardless of the complexity of the composition, I have is shit because I do not have a musically trained background?"
MSB: "I guess so..."
Me: "Well I am not in debt to a fancy music school and I still know how to play music so you're the idiot. I win!"
2. Something that the majority of modern music artists lack knowlege of
Person 2: "Whats common time?"
Person 1: "Oh great, I'm jamming with a moron."
You look like an asshole when you don't know music theory.
Music theory mostly deals with the earliest music ever written on paper to music written in the late 1800's.
Specifically, music theory is made up of laws, rules, labels and other insights regarding Western music (particularly its harmonic tendencies), pioneered by a man named Rameau.
Music came first, theory came after.
Also, something barely any musician has nowadays, and those who have none say that you "don't play from your soul" if you have knowledge of music.
These people are dumbasses.