Thank God my daughter likes everything from Bach to Linkin Park but does not listen to garbage. (well, except some of that thrash metal crud). She is a classical musician so she knows music from meritless noise.
Thrash metal is not garbage. Using an example, Iced Earth "The glorious burden"
Also take what i say with a grain of salt, I am a Freeper metalhead.
She is also a very good student--is yours also?