I want to experiment with sound transmitted through the body itself, so for my mono piece, I used a bone conductive tranducer. I bought this one from Adafruit and wired it up to a 5 volt amplifier. For my piece, the transducer is to be placed on the base of the back of the skull. For better sound quality, plug your ears.

The sound piece itself is not all that musically interesting. I focused on exploring the auditory range of the transducer, in order for the listener to experience how different frequencies feel when transmitted through the skull. The piece starts with a long glissando from 20Hz up to 10000 Hz and then back down. Then, I play notes spaced an octave apart from C3 up to C7, then back down again. Finally, I build a keyboard-spanning chord from those same Cs - although, as is usually the case with chords in music, the combination of all the octaves sounds to the ear that it is dominated by the lowest octave. Finally, I wipe that chord out from high to low, then end with a brief hit on the highest C. All the sounds are generated with sine wave oscillators.

The piece is written in ToneJS. You can download the source here - it should run in any browser. Don't panic if you don't hear anything for the first few seconds - your speakers may not be able to reproduce the lowest frequencies.

A visual score for the piece.
The transducer setup, using an Arduino board for power.

I found the long glissando up and down to be the most interesting part of the piece to listen to. It told me a lot about how sound travels through my body, and about the transducer itself. The transducer distorted at very low frequencies, but it was able to produce significantly lower frequencies than my laptop speakers. At higher frequencies, it bested my headphones, which cut out before reaching 10,000 Hz. I also learned that each of my two ears are better at hearing certain frequencies - at the higher end, the sound would seem to go left and right, so one of my ears must hear that frequency better than the other. Probably, I have partial deafness from listening to music with headphones, but it was unexpected and interesting to see how that deafness is unevenly distributed across the frequency spectrum and between my two ears. Most of all, the feel of the higher frequencies in the skull is distinctly different from the lower frequencies. And in particular, as the pitch rises, the sensation of building tension is much more visceral through the bone than it is through the air (including headphones). It's a weird blend of uncomfortable but ultimately satisfying. I hope that when I share my stereo piece with the class, I'll be able to give some of this experience.