"Art forms" or "art"

[Rachel Adams]

Hello.

Which sentence is correct? Can I use "art" instead of "art form"?

1. "Music and dancing are absolutely art forms."
2. "Music and dancing are absolutely art."
3. "Photography is an art form."
4. "Photography is art."

 

[Yankee]

Better understood and natural with "art forms".

 

[Tarheel]

I don't understand the use of absolutely. Maybe that person is arguing with somebody.

Bob: Dance isn't an art form.
Jane: It absolutely is!