I'm writing a paper titled "The Evolution Of The Musical Keyboard" for a college english class. I've been searching the web for sources. Anyone have any source sites to suggest??? I want to cover keyboards back 35 years.

Thanks,
Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.