SPARQL/21

SELECT
  ?lengua
  ?lenguaLabel
  ?conteo
WITH {
  SELECT
    ?lengua
  {
    ?audio
      prop:P2 entity:Q2;
      prop:P4 ?lengua.
  }
} AS %lenguas
WITH {
  SELECT
    ?lengua
    (COUNT(?lengua) AS ?conteo)
  {
    INCLUDE %lenguas.
  }
  GROUP BY ?lengua
} AS %conteoPorLengua
{
  INCLUDE %conteoPorLengua.
  SERVICE wikibase:label { bd:serviceParam wikibase:language "es". }
}
ORDER BY DESC(?conteo)