HARP (also known as Harmony and Acoustic Research Project) is a public seating area that also serves as a communal musical instrument. Designed specifically for urban parks, Dan LaBarca and Jeff Watson created HARP with four different parts, each of which have their own specific instrument and sound.

The separate quadrants are sectioned off into electric organs, pianos, steel drums, and chimes. HARP is also suitable for all different types of weather and has a decibel restriction to ensure that only those in the park can hear the music.