Also the Levites
Leviyiy  (lay-vee-ee')
a Levite or descendant of Levi -- Leviite.
which were the singers
shiyr  (sheer)
to sing -- sing(-er, -ing man, -ing woman).
all of them of Asaph
Acaph  (aw-sawf')
collector; Asaph, the name of three Israelites, and of the family of the first -- Asaph.
of Heman
Heyman  (hay-mawn')
faithful; Heman, the name of at least two Israelites -- Heman.
of Jeduthun
Yduwthuwn  (yed-oo-thoon')
laudatory; Jeduthun, an Israelite -- Jeduthun.
with their sons
ben  (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.
and their brethren
'ach  (awkh)
a brother (used in the widest sense of literal relationship and metaphorical affinity or resemblance (like 1) -- another, brother(-ly); kindred, like, other.
being arrayed
labash  (law-bash')
wrap around, i.e. (by implication) to put on a garment or clothe (oneself, or another), literally or figuratively
in white linen
buwts  (boots)
probably cotton (of some sort) -- fine (white) linen.
having cymbals
mtseleth  (mets-ay'-leth)
(only dual) double tinklers, i.e. cymbals -- cymbals.
and psalteries
nebel  (neh'-bel)
a skin-bag for liquids (from collapsing when empty); hence, a vase (as similar in shape when full); also a lyre (as having a body of like form)
and harps
kinnowr  (kin-nore')
a harp -- harp.
`amad  (aw-mad')
to stand, in various relations (literal and figurative, intransitive and transitive)
at the east end
mizrach  (miz-rawkh')
sunrise, i.e. the east -- east (side, -ward), (sun-)rising (of the sun).
of the altar
mizbeach  (miz-bay'-akh)
an altar -- altar.
and with them an hundred
me'ah  (may-aw')
a primitive numeral; a hundred; also as a multiplicative and a fraction -- hundred(-fold), -th), + sixscore.
and twenty
`esriym  (es-reem')
twenty; also (ordinal) twentieth -- (six-)score, twenty(-ieth).
kohen  (ko-hane')
literally, one officiating, a priest; also (by courtesy) an acting priest (although a layman) -- chief ruler, own, priest, prince, principal officer.
chatsar  (khaw-tsar')
blow, sound, trumpeter.
with trumpets
chatsotsrah  (khats-o-tser-aw')
a trumpet (from its sundered or quavering note) -- trumpet(-er).