Snow White's dwarfs and Hawthorne's gables

• Some Dixieland bands
• Harry Potter novels et al
• The Pleiades, et al
• Deadly sins and hills of Rome, e.g
• Trio-quartet combos
• Seven-player pieces
• Groups like Disney's dwarfs
• Lucky groups?
• Big singing groups

Wiktionary Word definitions in Wiktionary
n. (plural of septet English)