All sounds CC-by-sa Julien Jorge, produced with the following samples.

bronze:
CC-0 snardin42 http://www.freesound.org/people/snardin42/sounds/73200/

silver:
CC-0 caiogracco http://www.freesound.org/people/caiogracco/sounds/150453/

gold:
CC-by Benboncan http://www.freesound.org/people/Benboncan/sounds/91924/
CC-0 barkenov http://www.freesound.org/people/barkenov/sounds/148103/

applause:
CC-by: WIM http://www.freesound.org/people/WIM/sounds/23015/
