Mountains: (Breaking Forth Into Singing) of Exceeding Joy
Source: TTT
Isaiah 44:23
Sing for joy, O heavens, for the LORD has done this; shout aloud, O depths of the earth. Break forth in song, O mountains, you forests and all your trees. For the LORD has redeemed Jacob, and revealed His glory in Israel.
Isaiah 55:12
You will indeed go out with joy and be led forth in peace; the mountains and hills will burst into song before you, and all the trees of the field will clap their hands.