Here are some links you might find interesting or useful.
Textbook: Digital Sound Processing(and its Chapter Links, esp Chapter 11 on Interfaces)
120 years of Electronic Music (excellent overview with many links)
History of Musical Instruments
The Fairlight CMI
Novel instruments developed by Don Bulcha
Information on Musical Interfacing from CCRMA
Bill Buxton's home page
(radical thinker in interface design).
Try Bill's big list of
Different
Input Devices.
Information on MIDI
Time-line of Hypertext History.
ICMA - the International Computer Music Association
Please let me know of anything else you find interesting for this course.