If there is nothing in your tenancy agreement I would phone head office saying ' I believe you have changed or up-dated the tenancy agreements I don't appear to have received my new copy please could you send me one'
If they deny any changes explain about the childrens toys and the ban on drinking, don't mention music, and see what they say , Do ask for your name to be with-held if they propose to take any action against their employee
Can you listen to your music through ear phones? it can be annoying if neighbours don't like the choice of music.