This image is part of the KDE's Icons set Exquisite, which is a port of the Xp_Mad icon set created by Mimin Ladha. Additional icons by Ghast (action icons) were added to complete the icon set.
Exquisite-opera.png
Exquisite-opera.png: guppetto, and Mimin Ladha (Ghast ?)
SVG version : Wondigoma