By "acoustic" I mean music played on acoustic instruments like hands drums and banjos. By "rock" I mean music that has electric and electronic instruments, electronic processing like delayed feedback, and a generally rock-n-roll-ish beat. These two categories overlap a lot in my music, though.
Also under "Rock" you will find other people's recordings that I was part of that fairly defy classification.
"Instruments" means musical instruments that I build. Lots of photos of them. Banjos, dulcimers (electric and acoustic), autoharps, drums, bones.