refs #17489 [finc] add getter for marc 382a - Medium of Performance

* also see https://www.loc.gov/marc/bibliographic/bd382.html

module/finc/src/finc/RecordDriver/SolrMarcFincTrait.php

@@ -431,6 +431,27 @@ trait SolrMarcFincTrait
         return $this->getFieldArray('590', ['b']);
     }
 
+    /**
+     * Get an array of terms that indicate the instrumental, vocal
+     * and/or other medium of performance.
+     * https://www.loc.gov/marc/bibliographic/bd382.html
+     *
+     * @return array
+     */
+    public function getMediumOfPerformance()
+    {
+        if ($field382 = $this->getMarcRecord()->getField('382')) {
+            return $this->getSubfieldArray(
+                $field382,
+                ['a'],
+                true,
+                ', '
+            );
+        }
+
+        return [];
+    }
+
     /**
      * Get the ISSN from a record. Refs #969
      *