Related Clues:

• Lecture record
• Email
• In-box fillers
• Short messages
• E-mail, essentially
• Speaker's aids
• Music symbols
• Brief letters
• Flagship product from 21-Down
• Explanatory material
• Scoring units
• What the starts of 17-, 34- and 61-Across are
• Stack on the receptionist's desk
• Do, re, mi, e.g.
• Writes down