Via J-Walk’s, 120 years of electronic music1: Starting with Elisha Grey’s Musical Telegraph to nowadays synthesizers.
Includes Raymond Scott’s revolutionary Clavivox2, which inspired Bob Moog to start his own (famous) synthesizer company.
1Nov 13, 2012: changed the main url to go to new domain. Thanks to Sarah Thompson for pointing this out.
2Nov 13, 2012: Second link is dead.