It is a lonesome Glee — The Tempest

It is a lonesome Glee-1
Yet sanctifies the Mind-
With fair association-
Afar upon the Wind

A Bird to overhear 5
Delight without a Cause-
Arrestless as invisible-
A matter of the Skies.
(F.873/J.774)
[1] lonesome Glee:: Ariel's song.
[2, 3] sanctifies, association:: Ariel's song that sanctified Ferdinand and others.
[5] A Bird to overhear:: Ariel (a fairy that can fly like a bird) overheard Caliban's plan to murder Prospero.
[7] invisible:: no one can see Ariel but Prospero.
[8] A matter, Skies:: something related to weather, the Tempest.