'Harp' in the Bible

Yet even lifeless things, whether flute or harp, when producing a sound, if they do not produce distinct [musical] tones, how will anyone [listening] know what is piped or played?

And when He had taken the scroll, the four living creatures and the twenty-four elders fell down before the Lamb (Christ), each one holding a harp and golden bowls full of fragrant incense, which are the prayers of the saints (God’s people).