Vefsíður til athugunar
Hljóð og heyrn:
http://www.ma.is/ma/fonet/Talfaeri/eyrad.htm
http://arts.ucsc.edu/EMS/Music/tech_background/TE-03/teces_03.html
http://www.biols.susx.ac.uk/home/Chris_Darwin/Perception/Lecture_Notes/Hearing_Index.html
Tónlist:
http://www.avatar.com.au/courses/PPofM/INDEX.html
http://phy.mtu.edu/faculty/info/suits/scales.html