Actively participating listeners have been an essential part of musical performance ever since music was invented. In some genres, the performers can expect the audience to know in depth how the music works and express their appreciation - audibly - when something special happens. This is true for Indian classical music, Arabic art and popular music and pretty much every variety of African-American music. It often makes the performance completely unrecordable, since you need to be there and be able to discriminate the music from the reactions to it - but so what? Who needs all their music pickled?