Every person who releases something has their own idea of beauty in mind.  Even if they are trying to pull a fast one on their listeners, they still think, deep inside, that there is a beauty in it.  Marcel Duchamp signed a urinal and thought there was a beauty in it, even if it was in the fact that he got away with it.  I'm sure that jliat thought his book of a "wav form" with nothing but 000010000010100101010010  was beauty.   Even people who are against romantics are trying to do what they think is beautiful.  
Many people will argue that there is a "golden mean" to beauty.  Many more people try to disregard the idea of the "eye of the beholder".   
For me it is when someone creates a world that I want to visit,  or it is so fully realized that I feel like I'm already there, or when someone changes my perception, or when it speaks to my soul.   
I think that this can happen with lazy, stupid, crude, brutish, overly analytical, sexually depraved, crazy, insensitive and deplorable people just as much if not more than the synthesizer sunrise assholes.