The image shows a page from a sheet of music with the title "Missa Tertia" written in bold black font at the top. The page is filled with musical notes and symbols, indicating the melody and rhythm of the piece. The notes are written in a traditional treble clef and bass clef format, with the time signature of 4/4 and the key signature of G major. The background of the page is a light cream color, and the text is surrounded by a thin black border.