The Thongophone also known as a Tubulum and Slapophone, is a long pipe drum often made from segments of PVC tubing of different length arranged like a keyboard. This instrument is popularized by both Uakti and The Blue Man Group. It is played by smacking shut the tops of the tubes using a piece of rubber like material such as a sandal (thong) hence the name of the instrument.

The Thongophone can very visually as an instrument, largely due to the homemade nature of the majority of the instruments. Being made from readily available PVC tubing has allowed a great deal of varation in the pipe arrangements depending on the overall lengths and widths used.