Answer:
Without me everyone would lose their head. What am I?
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
I am known for my natural tuxedo and marching. What am I?
When you take away the whole from me, there is always some left. What am I?
I have roots nobody sees. I am taller than trees. Up, up I go but I never grow. What am I?
The profession of Jimi Hendrix and Eric Clapton