Which Israeli folk song is featured on Scottish bagpipes for the soundtrack album from Monty Python's Life of Brian?
Hava Nagila "Hava Nagila" (Hebrew: הבה נגילה‎ , "Havah Nagilah", "Let us rejoice") is an Israeli folk song traditionally sung at Jewish celebrations. It is perhaps the first modern Israeli folk song in the Hebrew language that has become a staple of band performers at Jewish weddings and "bar/bat mitzvah" celebrations. The melody is based on a Hassidic Nigun and it was composed in 1915 in Ottoman Palestine, when Hebrew was being revived as a spoken language for the first time in almost 2,000 years (since the destruction of the Second Temple in 70 CE). For the first time, Jews were being encouraged to speak Hebrew as a common language, instead of Yiddish, Arabic, Ladino, or other regional Jewish languages.
Unbennaeth Prydain Unbennaeth or Unbeinyaeth Prydein (Welsh for  "The Monarchy of Britain") was an Old Welsh composition that served as a kind of national anthem in Wales in the Early Middle Ages. The bards of the royal courts of Aberffraw, Dinefwr, Mathrafal, and Caerleon were required by law to follow the army and recite the song before and after every battle. For this service, he received the next-best beast from the spoils after the king's and was valued at 126 cows.