This image is a derivative work of the following images: File:Isointervallakkord-C+.png licensed with PD-ineligible 2011-01-28T17:16:02Z Katzmárek2 388x168...
following images: File:C_Dur_Klaviatur.png licensed with PD-ineligible 2007-02-06T11:10:11Z AndreasPraefcke 258x168 (1280 Bytes) C-Dur-Tonleiter Cropped...