▁in ▁use ▁as ▁the ▁Ext ra ordinary ▁Form ▁of ▁the ▁Roman ▁R ite . ▁ ▁In ▁the ▁modern ▁Lit ur gy ▁of ▁the ▁H ours ▁of ▁the ▁Roman ▁Catholic ▁Church , ▁the ▁Grad ual ▁Ps al ms ▁are ▁used ▁in ▁several ▁ways : ▁ ▁Ps al ms ▁ 1 2 0 - 1 2 7 ▁and ▁ 1 2 9 - 1 3 1 ▁are ▁scheduled ▁throughout ▁the ▁four - week ▁Ps alter ▁for ▁use ▁at ▁V es pers ; ▁ 1 1 9 , ▁ 1 2 8 , ▁and ▁ 1 3 2 ▁are ▁scheduled ▁for ▁use ▁for ▁Day time ▁P ray er , ▁and ▁ 1 3 3 ▁is ▁scheduled ▁for ▁Night ▁P ray er . ▁ ▁Ps al ms ▁ 1 1 9 - 1 2 7 ▁are ▁broken ▁into ▁three ▁parts , ▁to ▁be ▁used ▁as ▁the ▁complement ary ▁Ps alm ody ▁for ▁those ▁who ▁pray ▁three ▁day time ▁offices ▁separately ▁as ▁Ter ce , ▁Se xt , ▁and ▁None , ▁rather ▁than ▁one ▁office ▁of ▁Day time ▁P ray er . ▁ ▁They ▁are ▁used ▁as ▁the ▁sole ▁Ps alm ody ▁at ▁day time ▁prayer ▁on ▁solemn ities , ▁except ▁for ▁certain ▁solemn ities ▁of ▁the ▁Lord ▁and ▁during ▁the ▁oct ave ▁of ▁E aster ▁and ▁those ▁solemn ities ▁falling ▁on ▁Sunday . ▁ ▁References ▁ ▁External ▁links ▁Record ings ▁of ▁musical ▁settings , ▁he bre w ▁text , ▁translation , ▁transl iter ation ▁on ▁The ▁Z em iro t ▁Database ▁ ▁The ▁ps alm ▁ 1