Roza De Shabbes is one of the most famous cantorial pieces of all time.  One of the most famous recordings was recorded by Cantor Pierre Pinchik.  The album was a single 78 with two sides.  The clip plays both sides back to back with the ‘flip’ at 4:19. 

I’ve heard a rumour which I haven’t yet substantiated (or sourced) that the second half was recorded a half tone lower because Pinchik couldn’t sustain the first key.  Regardless of the veracity of the rumour, the second half is definitely a 1/2 tone lower.  This fact shouldn’t be regarded as a disparagement on this landmark recording, rather just an interesting historical footnote.

The source of this prayer which is recited at the inception of Shabbat (Sabbath) is the mystical (Kabalistic) Zohar.  A translation with commentary follows:

THE SECRET of Sabbath: She is Sabbath.
United in the secret of one
to draw upon her the secret of one.
When Sabbath enters she is alone,
separated from the Other Side, all judgments removed from her.
Basking in the oneness of holy light,
she is crowned over and over to face the holy King.
All powers of wrath and masters of judgment flee from her
There is no power in all the worlds aside from her.
Her face shines with a light from beyond;
she is crowned below by holy people,
all of whom are crowned with new souls.
Then the beginning of prayer,
blessing her with joy, with beaming faces.

Zohar 2:135a-b (thirteenth century); see Matt, Zohar, 132, 257-58.

She is Sabbath Shekhinah is the Sabbath Queen entering the palace of time every Friday evening at sunset. As the seventh sefirah below Binah, Shekhinah is the seventh primordial day. Friday evening is the time of her union with her masculine counterpart, the sefirah of Tif’eret. The Sabbath is God’s wedding celebration.
United in the secret of one … Shekhinah and her angels of escort join together in "the secret of one" in preparation for her encounter with Tif’eret, who has joined together with the sefirot surrounding him in a corresponding "secret of one." Shekhinah and Tif’eret must each be whole before they can unite.
the Other Side Aramaic, sitra ahra, the demonic realm, threatens Shekhinah and humanity on the weekdays. Once Sabbath begins, Shekhinah is safe and provides blessing openly to the world.
she is crowned over and over to face the holy King The Sabbath is referred to as Queen in Babylonian Talmud, Shabbat 119a: “Rabbi Hanina used to wrap himself in a garment, stand close to sunset as Sabbath entered, and say: ‘Come, let us go out to greet Sabbath, the Queen.’ Rabbi Yannai would put on special clothes as Sabbath entered and say: ‘Come, 0 Bride! Come, 0 Bride!’" Here in the Zohar, Shekhinah, the Sabbath Queen, prepares to meet King Tif’eret.
All powers of wrath … Once Sabbath has entered, the power of strict judgment disappears. According to Babylonian Talmud, Sanhedrin 65b, even the wicked in hell are granted rest on the Sabbath.
she is crowned below by holy people By welcoming the Bride and celebrating her arrival, human beings array her for the union with Tif’eret.
all of whom are crowned with new souls According to Rabbi Shim’on ben Laqish (Babylonian Talmud, Beitsah 16a), "The Holy One gives an extra soul to a human being on the eve of Sabbath. When Sabbath departs, it is taken away." The extra soul enables one to leave behind the turmoil of the week, to experience the joy and depth of Sabbath. Cf. Zohar 2:136b: "Every Friday evening, a being sits in the world of souls."
–Daniel C. Matt, The Essential Kabbalah: The Heart of Jewish Mysticism (Edison, N.J.: Castle Books, 1997), at 80, 189-90.