276 POPULAR LECTURES AND ADDRESSES. 



sure of air, are more abrupt, more sudden, less 

 smooth, and less distinctly periodic, than they 

 are in the softer, and purer, and simpler sound. 

 But the superposition of the different effects is 

 really a marvel of marvels ; and to think that 

 all the different effects of all the different instru- 

 ments can be so represented ! Think of it in 

 this way. I suppose everybody present knows 

 what a musical score is you know, at all events, 

 what the notes of a hymn tune look like, and 

 can understand the like for a chorus of voices, 

 and accompanying orchestra ; a " score " of a 

 whole page with a line for each instrument, and 

 with perhaps four different lines for four voice 

 parts. Think of how much you have to put down 

 on a page of manuscript or print, to show what 

 the different performers are to do. Think, too, 

 how much more there is to be done, than any- 

 thing the composer can put on the page. Think 

 of the expression which each player is able to 

 give, and of the difference between a great player 

 on the violin, and a person who simply grinds 

 successfully through his part ; think, too, of the 



