Her har jeg lenket opp til en on-line versjon av en amerikansk lærebok.
Den ser ganske bra ut, men jeg har ikke fått finlest alt.
De originale sidene inneholder denne "advarselen":
The following material is copyright 1994/1996 by Gary Daum, all rights
reserved. This online edition is presented as a service to the community
of Georgetown Preparatory
School. Any unauthorized reproduction is prohibited. This text,
based on the textbook "Music: A User's Guide for the Beginner",
is missing footnotes and illustrations. If you are interested in using
the full text, please contact Gary Daum to arrange a license agreement.