Creating music requires a coordination of a lot of moving parts. That's true whether you are in an orchestra or a rock band. The wonderful thing about music theory lessons is they give you the ability to understand how these elements come together to create music.
As someone who underachieved in music lessons early on at school, I was wary of taking music theory lessons. However, once I began grasping the fundamentals, I found creating and performing music a far more enriching (and easier) experience.
As I've then taken the step into professional singing and working with local amateur groups, I've found my theory background gives me an edge when talking to musicians and directing other people.
I'm a huge believer that all vocalists and instrumentalists should take the time to understand how music works, so I offer this as a service as well as the vocal coaching sessions. Most of my pupils prefer to work one on one with me so they can question things and move at their own pace. However, whenever I have multiple people interested in taking group sessions, I am happy to arrange a group classwork session to work and learn together.
Mattie is an aspiring singer who wanted to take music at college. The college required that he achieve grade 4 singing and grade 3 theory in order to take him on. Mattie struggles with maths, patterns, etc. so it was really necessary for him to go at his own pace and make his mistakes without worrying about being made to feel stupid.
We went through a highly structured course of music theory lessons that enabled him to understand one idea fully before moving on to the next. We mixed our lessons up with me telling him the theory behind an idea, then working through exercises to test his knowledge, and then exploring what this meant in terms of what we hear in music.
After nearly a year of lessons, Mattie took his exam with ABRSM and achieved a passing grade.