Question

berlioz famously makes use of musical quotation in his \dream of a witches sabbath\ from his symphonie fantastique. this musical quotation, included in the link below starting at 3:09, is from which musical source?
berlioz: symphonie fantastique - v. (dream of a witches s...
berlioz: symphonie fantastique
v. dream of a witches sabbath
watch on youtube
a gregorian chant
beethovens 5th symphony
turk music
zoufly dance music

Explanation:

In the fifth movement of Berlioz's Symphonie Fantastique, "Dream of a Witches' Sabbath", starting at the timestamp noted, Berlioz quotes the Gregorian chant Dies Irae, a traditional plainchant associated with the Catholic Requiem Mass, to evoke a macabre, supernatural atmosphere.

Answer:

a Gregorian chant