The Bible does mention, in Revelations of those who are playing harps before God. If you read Rev. 5:8 you find that it says:
“When He took the scroll, the four living creatures and the 24 elders fell down before the Lamb. Each one had a harp and gold bowls filled with incense, which are the prayers of the saints.”
This is being playing before God, Himself, declaring His holiness, which in the rest of the passage.
We also know that in II Timothy 3:16-17 it states:
“[SUP]16[/SUP] All Scripture is inspired by God[
b] and is profitable for teaching, for rebuking, for correcting, for training in righteousness, [SUP]17[/SUP] so that the man of God may be complete, equipped for every good work.”
Meaning that the NT is not the only part of the Bible that we use. We also refer to the OT. And in the OT, we find many verses that mention instruments being played to God, such as David on his Lyre. Two such passages are:
“[SUP]3[/SUP] Praise Him with trumpet blast; praise Him with harp and lyre. [SUP]4[/SUP] Praise Him with tambourine and dance; praise Him with flute and strings.”
Psalm 150:3-4
“[SUP]25[/SUP] Hezekiah stationed the Levites in the Lord’s temple with cymbals, harps, and lyres according to the command of David, Gad the king’s seer, and Nathan the prophet. For the command was from the Lord through His prophets. [SUP]26[/SUP] The Levites stood with the instruments of David, and the priests with the trumpets. [SUP]27[/SUP] Then Hezekiah ordered that the burnt offering be offered on the altar. When the burnt offerings began, the song of the Lord and the trumpets began, accompanied by the instruments of David king of Israel. [SUP]28[/SUP] The whole assembly was worshiping, singing the song, and blowing the trumpets—all of this continued until the burnt offering was completed.”
II Chronicles 29:25-28 (This passage is in fact at the temple.
Based upon the passages, and others, such as Nehemiah 12, it sounds like God expects us to use instruments to worship.
While, the few passages in the NT that I found that mentions instruments are found in Revelations, it does not mean that instruments are forbidden, nor does it mean that it was not used by the early church.