Joyful Sound IS the Feast of the LORD. There are 3 Seasons with 7 Feasts. The Feasts are "mow'ed" which are God's appointments with mankind.
Song of degrees or steps to perfection. Psalm 126 - 7th Psalm - The Great Thing. The Revelation of God Revealed in JESUS Only!
The Shema as a Seal. Hear O Israel. The judgments of God to reveal He is One.