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Adjective: long-playing  'long'pley-ing [N. Amer], 'lóng'pley-ing [Brit]
  1. (used of records) playing at a slower speed and for a longer time than earlier records
    "In any case, the term 'musical revolution' is hardly an exaggeration with regard to the long-playing record";
    - long-play

See also: slow

Encyclopedia: Long-playing