- - Groups of 4 or 2 pints best drunk without bottle-opener
- - String groups
- - Musical groups.
- - Squatter composing chamber music
- - Musical foursomes
- - The Beatles et al.
- - The Beatles and the Monkees
- - 68 works of Haydn
- - ABBA and Kiss
- - Boyz II Men and others
- - Sets of four
- - Foursomes
- - Certain musical works
- - Pieces of eight
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