"rare groove" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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        {
          "ref": "2011, Simon Reynolds, Bring the Noise: 20 Years of Writing About Hip Rock and Hip Hop:",
          "text": "The brainchild of DJ Gilles Peterson, it specializes in a dance-oriented fusion of rap, rare groove and jazz, combined with 'motivational' lyrics.",
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      "glosses": [
        "Soul or jazz music that is very hard to source or relatively obscure."
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      "id": "en-rare_groove-en-noun-rRbcNRhe",
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        "(music) Soul or jazz music that is very hard to source or relatively obscure."
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        "rare groove"
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  "word": "rare groove"
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  "lang_code": "en",
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          "text": "The brainchild of DJ Gilles Peterson, it specializes in a dance-oriented fusion of rap, rare groove and jazz, combined with 'motivational' lyrics.",
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        }
      ],
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        "Soul or jazz music that is very hard to source or relatively obscure."
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        "(music) Soul or jazz music that is very hard to source or relatively obscure."
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