55 The subject is probably indefinite, referring to bystanders in general who witness the procession.
56 The Hebrew text has simply “in holiness.” The words “who marches along” are supplied in the translation for stylistic reasons.
57 Heb “after [are] the stringed instrument players.”
58 To celebrate a military victory, women would play tambourines (see Exod 15:20; Judg 11:34; 1 Sam 18:6).
59 Heb “from the fountain of Israel,” which makes little, if any, sense here. The translation assumes an emendation to בְּמִקְרָאֵי (bémiqra’ey, “in the assemblies of [Israel]”).

In other versions

Your procession is seen, O God,

the procession of my God, my King, into the sanctuary—

the singers in front, the musicians last,

between them virgins playing tambourines:

“Bless God in the great congregation,

the Lord, O you who are of Israel’s fountain!”

Your procession, God, has come into view,

the procession of my God and King into the sanctuary.

In front are the singers, after them the musicians;

with them are the young women playing the timbrels.

Praise God in the great congregation;

praise the Lord in the assembly of Israel.

People have seen your procession, God,

the procession of my God,

my King, in the sanctuary.

Singers lead the way,

with musicians following;

among them are young women

playing tambourines.

Bless God in the assemblies;

bless the Lord from the fountain of Israel.

Your procession has come into view, O God—

the procession of my God and King as he goes into the sanctuary.

Singers are in front, musicians behind;

between them are young women playing tambourines.

Praise God, all you people of Israel;

praise the Lord, the source of Israel’s life.

They have seen your processions, O God,

the processions of my God, my king, distinctive in victory.

Singers went up front, those playing stringed instruments last,

between them young women playing tambourines.

Bless God in the assemblies,

Yahweh from the fountain of Israel.

They have seen thy goings, O God;

Even the goings of my God, my King, in the sanctuary.

The singers went before, the players on instruments followed after;

Among them were the damsels playing with timbrels.

Bless ye God in the congregations,

Even the Lord, from the fountain of Israel.

Public Domain