Musical Instruments:
Descriptions and information about piano, brass, percussion, wind, guitar, and string;-
http://www.essortment.com/in/Music.Instruments/
Guitars - how do they make their sounds, guitar as an electric signal source, hardware digital audio effects... http://www.geocities.com/radium_ds/
Health & Safety:
RAQ about heath in the music industry:-
http://www.usq.edu.au/faculty/arts/SAFETY/ARTSAFE/index.htm
Other:
Australian Performing Rights Association - Links to organisation of music industry and resources available:
http://www.apra.com.au