I think what defines a tune is that there has to be some pattern that your brain can latch on to. Something where your brain says (subconsciously of course), "THAT's where this is going". And then it fools you now and again, that is, it creates a tension. But a good melody brings it back to a comfort spot at the end. But it's that "latching on" to a pattern that to me separates music from just random noise.
Of course, what your brain latches on to is going to vary somewhat based on what your brain has been conditioned too, i.e. what culture you were born into.
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