(Click on any picture to see an enlargement.)
The third and fourth examples above are globutubular horns, a hybrid of globular and tubular instruments. Their bodies are combinations of globular air chambers and tubular air columns. These horns exhibit some sound and playing characteristics of each of their parents. The larger globutubular horns typically produce deep drones, similar to a didjeridu of much greater length, but with a more hollow tone that is characteristic of a globular horn.
Read an article I wrote about globular horns for the Journal of Experimental Musical Instruments.
Sound files (press each speaker icon below to hear the sounds):
Hear a hybrid globular-tubular horn
Hear a globu-tubular horn with resonator
Hear a globu-tubular horn with resonator played as a drum and a horn
Hear the "buzz technique" on a globu-tubular horn with resonator
Hear an excerpt of "US Clay" photo of US Clay instruments
"Globularity", a song performed on a variety of globular horns