It it a subjective matter. Imo the difference between art (not music) and entertainment is the intent of the author.
If the author plays (any genre) for himself (to express an emotion or a point of view on any kind of matter) he is an artist.
If the author plays (any genre) for the audience (in order to please its audience expectations or to attract a specific kind of audience) he is an entertainer.
That said, there are good and mediocre artists and there are good and mediocre entertainers.

In other words, art is purpose while the genre is form.

I'm not the one who is using their opinion to determine what is and is not music. There is a difference between opinion and fact. That was the whole purpose of me using the earth is flat etc. They were an analogy. I used these analogies as a means to say that your opinion does not change something by its definition. So if the earth is spherical, you cannot say that in your opinion it is not. Just like you cannot say that in your opinion, this is not music, because by definition it is music, just as the earth is spherical. I was not saying you literally believe these things, I was merely saying that your thought process was akin to these things. You were denying fact. This is what I was trying to convey. 
I apologise if I did not convey this clearly. However, my point still stands.

@bolded. It is interesting that you say that, as there are actually comedy genres within music. It does not stop it from being music.

My original post was a statement that the OP should not have asked what people 'consider' music, because it is not defined by opinion.

If the OP asked this: 

My girlfriend's kids like horror, slasher, and drama styles. I like them myself. Although I just think that they are entertainment and not movies. What do you consider them?

This would be considered bad form, as it is evident that films like Scream, Nightmare on Elm Street and the Notebook are movies.

This thread should not have been based on opinion whatsoever. It should have been a simple "I am unsure of whether this is music/film, as I am not familiar with this style. Can someone clarify whether it is music/film?"

Someone from the thread leaps into the fray and supplies an answer "Yes it is defined as music/film". 

/end thread.

Yes and a PM to boot, im aware of it but my view on it is this, you have different opinions, leave it at that, after all the arguing back and forth i should be handing out moderations to you both.

Just let it go, both of you.

And it's a question not an opinion.

The op asked if you, the reader, consider Metal, Techno or Screamo to be music or just entertainment, he wants personal opinions not battles to the death over what an outdated definitions brief classification of music is.

And the answer is, yes it's music, as I posted, personal preference does not matter, music is music.

You sound like a really old person..... It's music. It doesn't matter how the sounds are generated. I like some stuff like trance or techno but I don't really know jack shit about that type of music. I like mainly rock music. I have to be in the right mood for the heavy stuff.

I see that you were in a mood to debate.

The topic is set to "Do you consider METAL, techno, screamo, etc music or just entertainment?", how people choose to answer is entirely up to them, so long as they keep it civil, and both you and Toxy are failing to do that, if you consider that a lecture then so be it.

I would prefer however, that you dropped the discussion with each other entirely, as you have both already demonstrated that you are unwilling to let differing opinions pass.

Edit - removed my intitial comment to reflect Tachikoma's request.

Okay, noted. I shall put this behind me.

The dictionary definition of music stems from a time when the range of music was substantially limited, using such definitions to prove or disprove the categorization of what does and does not classify as music is shortsighted unless you dig in to the wording used.

If we expand upon a key point in the very defition you posted.

"1.vocal or instrumental sounds (or both) combined in such a way as to produce beauty of form, harmony, and expression of emotion."

We see that a large portion of what categorizes vocal, insutrumental of combined sounds as "music" is the listeners interpretation, and listeners the world over have categorically considered metal, techno, sceamo and every other genre, as "music", because those that willingly produce tracks of those genres, and those that buy the completed tracks either digitally or on cd, find an inherant beauty and expression of emotion in the recording.

 Also, the way you are reacting to the notion of being lectured is worrying, as you seem blind to the realization that you have been lecturing others in this very thread.