29:28a The whole assembly was worshiping,

All the people who were gathered there bowed low to worship Yahweh,
-or-
Then all the people bowed to honor Yahweh.

29:28b the singers were singing, and the trumpeters were playing.

(English Standard Version🙂 and the singers sang, and the trumpeters sounded.

while the singers sang and ⌊the priests⌋ were blowing their horns/bugles.
-or-
This happened while the others were singing songs and blowing the blowing instruments.

29:28a–b (reordered)

And so the singers sang, and the trumpets sounded and all the people bowed to honor Yahweh.

29:28c All this continued until the burnt offering was completed.

The songs and music kept going until the priests finished making the burnt offerings.
-or-
The musicians kept singing until the sacrificers finished making the completely burned sacrifices.

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