code: public GetAudioFeaturesForSeveralTracksRequest.Builder getAudioFeaturesForSeveralTracks(String... ids) {
      return new GetAudioFeaturesForSeveralTracksRequest.Builder(accessToken)
              .setDefaults(httpManager, scheme, host, port)
              .ids(concat(ids, ','));
    }
docs: Get audio features for multiple tracks based on their Spotify IDs.
  
  @param ids A comma-separated list of the Spotify IDs for the tracks. Maximum: 100 IDs.
  @return A {@link GetAudioFeaturesForSeveralTracksRequest.Builder}.
  @see <a href="https://developer.spotify.com/web-api/user-guide/#spotify-uris-and-ids">Spotify: URLs &amp; IDs</a>