Obsolete gives you a wide view on electronic music history through technical developments
http://www.obsolete.com/120_years/
this french site is a very good starting point for historical electronic studios related matters
http://sonhors.free.fr/ (in french)
but the daddy place to look is:
http://chem.ch.huji.ac.il/~eugeniik/
the aes vol 50 number 11:
http://www.aes.org/journal/sample_issue/toc.cfm
the Acid Varsity
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