music that serves as the basic for later styles; space invaders pac-man and donkey kong are all examples of what; beethoven was not of the upper class he was a commoner and of the middle class true or false; select all the ways in which musicals differ from operas mus 121; it is customary to stand during the hallelujah chorus from handel's messiah ; select all the ways in which musicals differ from operas ; wind ensembles stand while playing true or false; the tradition of standing during the hallelujah'' chorus began for what reason