The German artists Stephan Schulz just returned from a residency at the Banff New Media Institute were he started to develop a locative media based performance. Tin Drum consists of a physical drumming machine which is controlled by the readings of a GPS enabled HP iPAQ handset. A performer is outfitted with this wearable, location-based drumming machine. While walking and occupying public space the GPS data is analyzed and translated in to drumming patterns.
More info at the Tin Drum project website