Harp: Heard in Heaven, in John's Apocalyptic Vision
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Revelation 5:8
When He had taken the scroll, the four living creatures and the twenty-four elders fell down before the Lamb. Each one had a harp, and they were holding golden bowls full of incense, which are the prayers of the saints.
Revelation 14:2
And I heard a sound from heaven like the roar of many waters and the loud rumbling of thunder. And the sound I heard was like harpists strumming their harps.
Revelation 15:2
And I saw something like a sea of glass mixed with fire, beside which stood those who had conquered the beast and its image and the number of its name. They were holding harps from God,