What is the difference between music and an aesthetically interesting grouping

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What is the difference between music and an aesthetically interesting grouping of sounds? I ask because I was listening to the opening of Alfred Hitchcock's The Birds and I while I found the sounds which were made to resemble a flock of birds to be very interesting and even quasi-musical sounding at times it didn't sound like music. It really is brilliant so why or why wouldn't it qualify as music? Listen to it yourself: http://www.youtube.com/watch?v=E0DeA6PPbMI/