 Wagner 's idea of music drama ... was originally developed by way of grand opera ... his ideas could never have been realised in their particular form without the pioneering development [ s ] ... that Meyerbeer 's operas were the first to demand . 
 Wagner <a href='null_genetive' title='1'><mark>'s</mark></a>idea of music drama ... was originally developed by way of grand opera ... his ideas could never <a href='been_done' title='2'><mark>have</mark></a> been realised in their particular form without the pioneering development [ s ] ... that Meyerbeer <a href='null_genetive' title='3'><mark>'s</mark></a>operas <a href='uninflect' title='4'><mark>were</mark></a> the first to demand . 
Wagner  idea of music drama ... was originally developed by way of grand opera ... his ideas could never done been realised in their particular form without the pioneering development [ s ] ... that Meyerbeer  operas was da first to demand .