I heard a voice from heaven like the sound of many waters and like the sound of loud thunder, and the voice I heard was like the sound of harpists playing on their harps.

And I saw what looked like a sea of glass mixed with fire and, standing beside the sea of glass, those who had been victorious over the beast and his image and over the number of his name. They held harps of God

And when he had taken the scroll, the four living creatures and the twenty-four elders fell down before the Lamb, each one holding a harp and golden bowls full of incense, which are the prayers of the saints.

If even lifeless things, such as the flute or the harp, do not give a distinction in the notes, how will any one know what is played?