Answer:
Tear one off and scratch my head, what once was red is black instead!
This is the drinkable phase of matter
What occurs four times in every week, twice in every month, only once in a year but never in a day?
Proof you've done your time in school
What comes in many varieties and can't be seen or touched, but it often makes you move?
I am a rock group with four members. All dead one was assassinated.