MuVis is a music visualiser that uses your device's microphone to interpret the audio to animated visualisations.
The animation is controlled by the intensity of the audio, so use the slider control to fine tune the sensitivity for your current environment.
Quality settings can be changed to give smooth animations on lower specification devices.
Perfect app for parties, especially if you can output to a TV or projector!
Animations supplied by Justin Whindle at blog soulwire.co.uk