Wandering through the floor of a casino past hundreds of different chiming slot machines. Sorry just recorded on an i-phone mic, but it's nice and long.
Small crowd on a ferry wharf at circular quay in sydney, australia. Generic background chatter and city hum. Good general purpose small crowd sound, can also pass for a big interior because of the wharf acoustics.
Crowd making some noise at a sanfl aussie rules football match (sturt vs port 2017 grand final). Recorded on sony mp3 recorder, converted to wav using audacity.
A crowd noise created my a bunch of pupils talking about different things at the same time. Some parts were reversed to disguise the language (which was russian) and the actual meaning of words.
I recorded some sounds in my school with voices, then i added a percussion record and i made them repeat several times. This make a sound to show that one sound can be louder than an other and make this sound unique. When you talk to someone you heard all noises around you but you really listen to what he is telling you.