Possible Clues:

• After one month, in short, hail to such notes (6)
• Hail to the month of eight that's not the eighth
• Group of eight lines
• Note an eighth above or below another
• Do re mi, etc.
• Days of celebrating in wide street at end of month
• Eight-line stanza
• Set of eight notes
• Series of eight notes on a scale
• It goes from C to C