Many other evidences of Unity are invariably present in good music, so naturally and self-evidently that they almost escape our notice.

Some of these are left to the student's discernment; others will engage our joint attention in due time.
* * * * * * In every one of these manifestations of unity there lies the germ of the principle of Variety, which quickens into life with the action of the former, always following, as offspring and consequence of the primary unity.

Thus:-- (1) The _beats_, though uniform in duration, differ from each other in force.

The first pulse in each measure (or metric group of any size) is heavier, stronger, than the following.

It--the first--is the "impulse," and is what is called the accent.