 I have all around me the spectacle of composers who , after their generation has had its decade of influence and fashion , seal themselves off from further development and from the next generation ( as I say this , exceptions come to mind , Krenek , for instance ) . Of course , it requires greater effort to learn from one 's juniors , and their manners are not invariably good . But when you are seventy @-@ five and your generation has overlapped with four younger ones , it behooves you not to decide in advance " how far composers can go , " but to try to discover whatever new thing it is makes the new generation new . ( Stravinsky and Craft 1980 , 133 ) 
