This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Tenor clef.svg Tenor clef Note that the bottom of the tenor clef and thus the middle of the clef is raised one barline off the bottom line If you are still unsure of the difference between alto and tenor clef notice that on the figure of the alto clef the clef extends across all barlines but here it only appears to extend across