what is the difference between good and bad music


my friend says rap is bad music. another friend says mahler is a terrible composer.

is it all subjective, i.e., a matter of opinion ? or are there standards which can distinguish good from bad music, however one defines these terms ?

if there are standards, can one specify them or refer me to a source ?
mrtennis
Any Psychiatrist would say that what we percieve should be percieved by the vast majority of others for it to be true. This is called the reality check.
Therefore by definition Pop music is good and everything on the fringe of lunacy in terms of preference. I think that the current generation of popular music is mostly unlistenable so I am clearly unable to discern good music from bad, I listen to what makes me happy, even classical which no one listens to anymore (except a few of philes).
Rap is kinda like some sort of coded message that only a few can understand what all the lingo means. I guess they believe rap helps them to understand what the heck is going on in their world, helps that crowd to deal with current issues.
As does classical help me to deal with issues surrounding my life.
Over at gramophone I posted a topic last week: "how much of all classical music do you like?" I figured there are over 5000+ composers in the past 300 yrs, most of which do not have their scores in recorded mediums. Tulane has (had I should say, as I think flood waters from katrina flooded the basement of the library, where the music room is), the book was a encylopedia of sorts , composers past 300 yers.
I have 25 composers represented on my shelf, and have come pretty much an end of cd buying. I have found all the composers I think are interesting.
So thats only 25 composers out of a possible 100 majors, and another 200+ second tier, and then another 4K marginal composers. Thats like 1% of all classical represented on my shelf. I expect little additions, as I've completed my cd collection in classical just last month.
Some of the gramophone group didn't quite like my post.
Good to me means does the music/composer add any meaning to my life.
Not to say Brahms is bad music, just insignificant for me. Thus Brahms gets no shelf space.
How is this an insult to classical tradition?
Have I tarnished the Brahms image?
I got the feeling some european forum members wre a bit upset that an old european standard was under criticism.
As though I failed to pay proper respects to The Classical Tradition Shrines.
Bartokfan, your preferences seem to match mine as far as mine go. That's not very far, so I am asking if you would care to name your 25 composers.