Kabbalah к Шир ха-ширим 1:1

Rabbi Chiya said: One day I was traveling to Rabbi Shimon to be taught by him the laws of the Pesach. I encountered a mountain and I saw clefts and cavities in one rock, and two men were in there. As I approached, I heard the voices of these people who were saying, "A song, a psalm for the sons of Korach, Great is Hashem and highly to be praised..." (Tehilim 48:1-2). Why "A song, a psalm?" Thus do we learn on behalf of Rabbi Shimon: The song is two-fold, and since it is a better song than other songs, it is named "song" twice. Similarly, "A psalm, a poem for the Shabbat day" (Tehilim 92:1). In the same fashion, "the song of songs which is Solomon's" (Shir Hashirim 1:1), a song that stands above all other songs.