Main message: Praising the Lord God Almighty because He is holy. 

Bible references:

• V1. "Holy, holy, holy! Lord God Almighty" (Revelations 4:8)

• V2. "around the glassy sea" (Revelations 4:6)

"Who wert, and art, and evermore shalt be" (Revelations 4:8)

• V3. "Though the darkness hide Thee" (Psalm 97:2)

"There is none beside Thee" (1 Samuel 2:2)

Keywords: holy, Lord God Almighty, merciful, mighty, eternity, adore, glory, perfect, power, love, purity

Interpretation notes:

• The opening chords for ‘Holy, holy, holy!’ use the tonic and dominant in E-flat major. 

• The rhythm uses quarter notes and half notes to end each subphrase. 

• The melody begins with an ascending motion. 

• The hymn uses a steady quarter-note rhythm, full four-part harmony, and 4/4 meter.