> (so.  are there "superconductors" of sound where the speed and
> "resistance" are dramatically different than normal solids?  How
> about phonic semiconductors? (phononics?))

Don't know. These guys include unusual properties and effects in
their pages, but nothing mentioned about the speed of sound in
extraordinary circumstances

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe2.html#c1

Home page

http://hyperphysics.phy-astr.gsu.edu/hbase/hph.html

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