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THE SONG-FORM WITH TRIO.
Another method of enlargement consists in associating two different--though somewhat related--Song-Forms.

The practice was so common in certain of the older dances, particularly in the minuet, that this design is also known as the _Minuet Form_.
THE PRINCIPAL SONG .-- The first division, called the principal song, is either a Two-Part or a Three-Part Song-form,--most commonly the latter.
It is generally entirely complete in itself; the fact that another division is to be added, does not affect its character, form, or conception.
THE "TRIO," OR SUBORDINATE SONG .-- The division which follows, as second song-form, was formerly called the "Trio," and it has retained the name in the majority of examples of this form, although the old custom that gave rise to the term has long since been discontinued.

A more accurate designation, and one that we shall here adopt, is "Subordinate Song." (Other names, which the student will encounter, are "maggiore," "minore," "intermezzo," "alternative," etc.).
Like the principal song, its fellow (the subordinate song) may be either a Two-Part or a Three-Part design.

It is very likely to resemble its principal song in species of measure, tempo, and general style; and its key may be the same as that of the principal division, or, at least, related to it.