The sea is likely the same one mentioned in the throne scene of Revelation 4:6. The difference here is that it is mingled with fire which may signify coming judgment or the fiery trials Christians go through to at last stand upon this sea. (Ezekiel 13:9; Malachi 3:2-4; 1 Corinthians 3:12-15; 1 Peter 1:7) Though the devil and his allies intended to defeat them, here they stand victorious. In Revelation 5:8; Revelation 14:2, we have seen the harps as representative of joyful music and a sweet sound. Here, God has given the redeemed the ability to make joyful music and a sweet sound.

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