THIS IS THE DAY is presumably a folk tune from Fiji, arranged by Les Garret for use with stanza 1. Antiphonal performance between two parts of the congregation works well. Rather than give verbal instructions, a song leader can direct simply by signaling to each group when they are to sing. For example, for stanza 1,

(group 1)
This is the day,
that the Lord has made,
we will rejoice,
and be glad in it

(group 2)
This is the day,
that the Lord has made,
we will rejoice,
and be glad in it

(both)
This is the day that the Lord has made,
we will rejoice and be glad in it;

(1)
this is the day,

(2)
this is the day

(both)
that the Lord has made.

When a song leader sings the first part as a solo, the congregation can follow from memory, without having open songbooks. Use a light organ registration or preferably folk instruments such as guitar and/or tambourine. The syncopations give the tune rhythmic interest and unity. Take care not to rush the tempo.

--Psalter Hymnal Handbook