The odes in the Septuagint.

Counted among the apocrypha.

Attributed author(s).
Moses, Hannah, Isaiah, Jonah, Habakkuk, Daniel, Mary, Zacharias, Simeon.

Text(s) available.
None on site.
Swete LXX (Greek only).
Boston University: Odes (Greek only).
Kata Pi LXX: Odes 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 (Greek and English).
Sacred Texts: Odes 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 (Greek only).

Useful links.
Gloria in Excelsis Deo in the Catholic Encyclopedia.
Odes parallels at Kata Pi.

The odes rank among the apocryphal books in the Old Testament.

Most of the LXX odes are repeats of material present in other books, both canonical and noncanonical:

Ode. Title. Source.
1. Song of Moses 1. Exodus 15.1-19.
2. Song of Moses 2. Deuteronomy 32.1-43.
3. Prayer of Hannah. LXX 1 Kingdoms 2.1-10.
4. Prayer of Habakkuk. Habakkuk 3.2-19.
5. Prayer of Isaiah. Isaiah 26.9-20.
6. Prayer of Jonah. Jonah 2.3-10.
7. Prayer of Azariah. LXX Daniel 3.26-45.
8. Song of the three. LXX Daniel 3.52-88.
9. Prayers of Mary (magnificat)
and Zacharias (benedictus).		 Luke 1.46-55, 68-79.
10. Song of Isaiah. Isaiah 5.1-9.
11. Prayer of Hezekiah. Isaiah 38.10-20.
12. Prayer of Manasseh. Refer to 2 Chronicles 33.10-13.
13. Prayer of Simeon (nunc dimittis). Luke 2.29-32.
14. Hymn of praise. None.

Only the last of the odes is a fresh composition, though its first verse does appear to derive from Luke 2.14. This ode is related to the gloria in excelsis deo of the Roman Catholic mass.