Related Clues:

• Music symbols
• Poem parts
• Brief letters
• Flagship product from 21-Down
• Explanatory material
• Scoring units
• What actors memorize
• What the starts of 17-, 34- and 61-Across are
• Do, re, mi, e.g.
• Writes down
• Do, re and mi, etc.
• Arpeggio components
• They're taken or passed in class
• Dialogue units
• Wrinkles