1. Create a new flow, and input your musical example.
  2. In the Master Page Editor, set the Flow Filter to display only the main music flow.
  3. Using the Frames editing tool, resize the music frame to make space for your footnote.
  4. Create a text frame for your footnote text.
  5. Create a music frame for the musical example, and ensure the filter is set to the Footnote example.
  6. Set the music frame margins, and space size to accommodate the music.