By linking to full-text historical (mostly-)German periodicals available freely on the Web, this Wikisource webpage brings together the efforts of many digitization initiatives (e.g. Google, HathiTrust, Münchener Digitalisierungszentrum, etc.) Access this wonderful resource at: http://de.wikisource.org/wiki/Zeitschriften_(Musik)
Research Tools
Classical Music Library
Classical Scores Library
DRAMIndex to Printed Music
International Index to Music Periodicals Full-Text
JSTOR
Naxos Music Library
Oxford Music Online
Proquest
Dissertations & Theses
RILM
Music Library RSS 
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A collection of historical German language periodicals available for free on the Web