Richness and interestingness of sound: including not only unique sounds=

, but
unusually pleasant ones that might make for background ambience.  Many natu=
ral sounds
are "in your face," such as great recordings of Spotted owls, especialy whe=
n made with
parabolas. These are interesting, but people are adapted to music, and you =
can't play this
while making dinner or reading a book, or typing on your computer.  They ar=
e a curiosity
often not interesting to the new generation, but only to the serious natura=
list.  The goal is
to recruit more naturalists.