It's a good old song, more than a bit sentimental, and the LBW version offers five stanzas about the "happy harbor of the saints," with its "gardens and [its] gallant walks," its flowers and fruitful trees.
But like so many old hymns, this one -- apparently both known from a manuscript and first published in 1601 as Hierusalem etc. -- has many stanzas which are not printed in most hymnals. Oremus Hymnal offers 25, although some versions include as many as 55. Most are fairly banal, and their customary omission is no great loss. But others may be worth a look.
Of particular charm to us, at least, are three stanzas which describe the choir of saints:
as master of the choir:
ten thousand times that man were blessed
that might this music hear.
Our Lady sings Magnificat
with tune surpassing sweet,
and all the virgins bear their part,
sitting at her feet.
There Magdalen hath left her moan,
and cheerfully doth sing
with blessèd saints, whose harmony
in every street doth ring.
Nice, right? A bit more detail than the usual "heavenly chorus," right down to the tune being sung. We'll think of it at Vespers.