 
            
            
            
            
                29 Aug
                
                    2011
                
            
            
                29 Aug
                
                '11
                
            
            
            
        
    
                11:25 a.m.
            
        Wherever its origin, it is featured in SICP which was out in 1984: http://www.youtube.com/watch?v=zQLUPjefuWA It's a sound analogy.