Marks that did limit lands in former times

Marks that did limit lands in former times
None durst remove; so much the common good
Prevailed with all men: 'twas the worst of crimes.
The like in Music may be understood,
For that the treasure of the soul is next
To the rich store-house of divinity:
Both comfort souls that are with care perplext,
And set the spirit both from passions free.
The marks that limit Music here are taught,
So fixed of old, which none by right can change,
Though Use much alteration hath wrought,
To Music's fathers that would now seem strange.
The best embrace, which herein you may find,
And th' author praise for his good work and mind.