You shall have a song, as in the night when a holy feast is kept; and gladness of heart, as when one goes with a flute to come into the mountain of the LORD, to the mighty One of Israel.
All Commentaries on Isaiah 30:29 Go To Isaiah 30
George Leo Haydock
AD 1849
Night. When the festivals commenced. (Calmet)
He may particularly mean that night, when the destroying angel slew the Egyptians. (Vatable)
Pipe. Music. (Haydock)
This was not prescribed.