| Notational remarks |
The doh clef appears on the top line, indicating the position on the staff of doh in the scale ("do-re-mi-fa-sol-la-ti-do"). |
The custos at the end of a line is a guard or helper, indicating what the first tone on the next staff will be.
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The pes is a symbol of two tones, where the lower tone is chanted before the upper tone.
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If there is a punctum followed by a pes  , then the punctum is chanted together with the first tone of the pes if they are on the same line or space (as though they were a single "note").
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