The answer is: Thousands upon thousands of angels

Rev 5 vs 11-12

When we dive into Revelation 5:11-12, we find a truly celestial scene. Visualize a multitude of angels, “thousands upon thousands” they are described, amplifying an atmosphere of awe and reverence as they proclaim, "Worthy is the Lamb who was slain!" This phrase captures not just admiration but also signifies a deep, sacrificial love that stands at the heart of cosmic harmony.

The imagery of the Lamb resonates through many scriptural echoes; for instance, in the Passover feast, the slaughter of the lamb represents liberation and protection. It creates a link to hope and redemption rooted deep in Jewish tradition. Revelation’s portrayal refers all the way back to Isaiah, where the suffering servant is compared to a lamb led to slaughter. This connection enhances the understanding of the Lamb in Revelation as not only a current story but encapsulating a rich tapestry of faith and tradition that brings the audience both peace and realization.

What’s more, this scene is set in a heavenly court where worshipped figures, elders, and unseen host join in harmony—a striking reminder that in the biblical worldview, the spirit of fellowship transcends earthly barriers. Further adding to the drama is the use of a song of recognition, reminiscent of how group singing can unite people, even today. Therefore, from an ancient tune, we hear a call that still echoes back through time as an ushering of hope and transformation in the universe. Amusingly enough, some might imagine that heavenly applause was the original concept of a "fan club" fans who've truly echoed praise across the ages!