Related Clues:

• The Three Tenors, e.g
• Snap, Crackle and Pop, e.g
• Threesome ... or a hint to this puzzle's theme
• More than a couple
• The Magi, by census
• Athos, Porthos and Aramis, e.g
• Trilling twosome
• Destiny's Child was one
• Pair of performers
• The Stooges, e.g
• Simon and Garfunkel, e.g
• Wedding band, perhaps
• The Swell Season, e.g
• Act with two mikes
• Beach volleyball team, e.g