Here we go:
I can be sneaky,
I can have thorns,
I can even be a coward,
I can be thick or thin, live or dead,
AND I can play classical music.
What Am I?
HINT:
I can be brush. (Courtesy of Chad W's answer and my dyslexia)
I really thought this one would be answered by now so here's another HINT:
I can be hay.