"The song of Moses" (Exodus 15:1) celebrated the ancient deliverance of the people of God by the Red Sea, just as Noah had been delivered very long ago by the Great Flood. "The song of the Lamb" (Revelation 5:9) celebrated the similar deliverance of the whole world by the Lamb, whose death and resurrection was the price of the world's redemption from its captivity by Satan. This redemption is symbolized by the waters of baptism (compare 1 Corinthians 10:1,2; 1 Peter 3:18-22; Romans 6:3,4). In the eternal earth there will be "no more sea" (Revelation 21:1), but there will always be a remembrance of these great deliverances, and this will be memorialized by the crystal sea at the heavenly throne (Revelation 15:2).

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8