1 - stirring coffee
2 - metal bowl
3 - metal bowl with water
4 - metal bowl with swirling water
5 - wet finger on wine glass
6 - oscillating electric fan
7 - flapping cardboard
8 - two sine waves, one starts low and rises to meet the other
9 - two sine waves, start out the same and one decreases very slightly over time
10 - two sine waves, start out the same (222Hz) and one decreases to 111 Hz. The overtones sound like there's a rising pitch but there isn't.
11 - same as above, but with square waves
12 - same as above, but with triangle waves
13 - same as above, but with sawtooth waves
14 - sine wave rising from 20Hz to 20,000Hz (I can't even hear the bit above 15,000)
15 - square wave rising from 5Hz to 20,000Hz (note how the frequency of the change in frequency results in audible tones - listen to this one in a sound app that has a graphical representation)
FlexiMusic has some good sine wave generator software. (freeware, Windows)
NCH Tone Generator is good too. (freeware, Windows) I used it for the digital sounds above.
The discussion this week reminded me of a thought I had a while ago, about the difference between 'urban' music and 'rural' music. Music made in the city by people raised in the city tends to have faster, more pronounced rhythms - evoking the sounds of traffic, trains, and other city sounds. While country/western music tends to have slower, less pronounced rhythms, which to me evoke the image of open skies and open land, where the natural rhythms are those of wind in the trees, the ripple of water in a pond.