Well, what about the harps of Heaven? Fair enough, what about the harps of Heaven?
First, what do activities in Heaven have to do with you and me right now, if that is indeed the setting in the contexts of Revelation 5:8, 14:2, and 15:2. Further, find any scripture where any heavenly hosts are commanded something to which I am amenable. Sure, they sing but I am commanded to sing on earth (Ephesians 5:19; Colossians 3:16) and this has nothing to do with my afterlife. Likewise, just because something is practiced or authorized in Heaven doesn’t mean I can do it in this life (try flying, cf. Revelation 12:14).
Second, what about the figurative use of terms? Who believes we will get a 666 tattooed to our forehead? Note the verses in their context. In Revelation 5:8, 24 elders had “every one of them harps” but they also had “golden vials full of odours,” which “are the prayers of saints.” If the golden vials are prayers, what are the harps? In the very next verse, they had “sung a new song.” John said he “heard the voice of harpers harping (playing, NKJV) with their harps” (14:2) and in the very next verse “they sung as it were a new song.” Those who gained a victory over the beast “having the harps of God… sing the song of Moses the servant of God, and the song of the Lamb” (15:2-3). Finally, the only place that “playing” is used is in Revelation 14:2 where John heard the “voice” of harpers “playing” their harps. It appears that the figurative expression for singing is harping.
Why not do away with all the harping and, “singing and making melody in your heart to the Lord,” praise God in the way in which He instructs?