WHAT MAKES *ACTUALLY* GOOD MUSIC?

Despite of the provocative title, there are as many answers as questions.
Such a subjective topic, i've been thinking many times "what makes some songs sound good more than other songs?"

Now i fully understand that this is extremely subjective, delicate and complex issue.

But let me give you a little bit background for this topic.

Long time ago when classical composers created their masterpieces they had only few 'resources' to use : notes, maestro, musicians and their instruments.
Please, note here that actually "notes" are only part of the overall big auditory picture.

When composer creates a song for e.g. played by piano. The overall 'audioscape' will be defined by the melody (notes), player and the instrument (piano, in this case). Piano can produce certain kind of sounds, mostly depending on player's skills and note velocity (i.e. volume in laymen's term).

Back to the future. Now days, instruments, recording equipment and overall sound engineering play much bigger role than before. Example, one can create good (subjectively) sounds independently of actual melody.
And also other way around, 'good' melody played by lousy sounds can still be fairly good melody.
Extreme example could be a top chart dance hit which sounds good (subjectively) by most of the listeners. But that song might not sound ("be") good played by another instrument (e.g. violin or piano).

This is the thing which makes music very interesting; complex integration of the melody and the sounds.

Which was the first one, chicken or egg?
I don't care. If song sounds good then it's good.