IMPORTANT: The sheet music has been marked up in blue where there is a change or something else to be aware of when learning the song. Where there is a blue mark of any kind, there will be a corresponding note in the errata page that is at the end of the sheet music. If there are no errors or changes to the original sheet music, there are no markings and no errata sheet.
For some songs, sheet music marked with breathing plans or interp instructions is included at the end of the document.