3 Such as at once might not on living ground,

at once > at one time; one time, hence: ever on living ground > [in the living world, in the present world]

4 Save in this paradise, be heard elsewhere: 5 Right hard it was, for wight which did it hear,

Right > Very wight > person, man, mortal

6 To read what manner music that might be:

read > discern manner > sort [of]

7 For all that pleasing is to living ear 8 Was there consorted in one harmony:

consorted > accorded, joined in accord

9 Birds, voices, instruments, winds, waters, all agree.

212.71