▁Similarly , ▁" 3 rd ▁part " ▁mark ings ▁may ▁be ▁used ▁for ▁triple ▁ch ants . ▁ ▁An ▁example ▁of ▁a ▁double ▁chant : ▁ ▁Below ▁are ▁the ▁four ▁lines ▁of ▁the ▁do x ology ▁Gl oria ▁Patri ▁( comm only ▁known ▁as ▁the ▁" G l oria "), ▁with ▁the ▁text ▁col oured ▁to ▁show ▁which ▁words ▁correspond ▁to ▁which ▁notes ▁in ▁the ▁music ▁( point ing ▁var ies ▁from ▁cho ir ▁to ▁cho ir ): ▁ ▁Gl ory ▁be ▁to ▁the ▁Father , ▁and ▁' ▁to ▁the ▁' ▁Son ▁: ▁and ▁' ▁to ▁the ▁' ▁Holy ▁' ▁Ghost ; ▁As ▁it ▁was ▁in ▁the ▁beginning , ▁is ▁now , ▁and ▁' ▁ever ▁' ▁shall ▁be ▁: ▁world ▁without ▁' ▁end ▁A ▁' ▁- ▁- ▁' ▁men . ▁ ▁The ▁do x ology ▁Gl oria ▁Patri , ▁usually ▁s ung ▁at ▁the ▁end ▁of ▁a ▁ps alm ▁or ▁cant icle , ▁is ▁two ▁vers es ▁long . ▁Depending ▁on ▁the ▁type ▁of ▁chant , ▁it ▁is ▁s ung ▁in ▁one ▁of ▁the ▁following ▁ways : ▁to ▁a ▁single ▁chant ▁s ung ▁twice , ▁to ▁a ▁double ▁chant , ▁to ▁an ▁appropriate ▁ 1 4 ▁bars ▁( us ually ▁specified ▁by ▁the ▁composer ) ▁of ▁a ▁triple ▁chant ▁or ▁quad ru ple ▁chant . ▁ ▁Ac comp an iment ▁Ps al ms ▁may ▁be ▁s ung ▁un ac comp an ied ▁or ▁accompanied ▁by ▁an ▁organ ▁or ▁other ▁instrument . ▁Organ ists ▁use ▁a ▁variety ▁of ▁registr ations ▁to ▁mirror ▁the ▁changing