1 Augmentation Of The Regular Form
To this species belong those
forms (small and large) which are provided with a separate
Introduction, or Interludes, or an independent Coda (in addition to,
or instead of, the usual consistent coda).
For example, Beethoven, pianoforte sonata, op. 13, first movement; the
first ten measures (Grave) are a wholly independent Introduction, in
phrase-group form, with no other relation to the following than that
of
key, and no connection with the fundamental design excepting that of an
extra, superfluous, member. The principal theme of the movement (which
is a sonata-allegro) begins with the Allegro di molto, in the 11th
measure. Similar superfluous sections, derived from this Introduction,
reappear as Interlude between the Reposition and Development, and near
the end, as independent sections of the coda.
In a manner closely analogous to that just seen, the fundamental design
of any movement in a concerto is usually expanded by the addition of
periodically recurring sections, called the tutti-passages, and by
a cadenza, occurring generally within the regular coda. In some
concerto-allegros (for instance, in the classic forms of Mozart,
Beethoven and others), the first orchestral tutti is a complete
introductory Exposition, in concise form, of the thematic material
used in the body of the movement. See the first piano-forte concerto
of Beethoven, first movement.
Further, when the design is one of unusual breadth, as in some
symphonic movements, or in elaborate chamber music, the number of
fundamental thematic members may be so multiplied that it is necessary
to assume the presence of two successive Subordinate themes, of equal
independent significance,--such significance that neither of them could
be confounded with a mere codetta, or any other inferior thematic
member. See Beethoven, pianoforte sonata, op. 7, first movement; the
Subordinate theme runs from measure 41 to 59; it is followed by another
thematic section (60-93) which is so independent, important and
lengthy, that it evidently ranks coordinate with the former, as second
Subordinate theme. It might, it is true, be called the second Part of
the Subordinate theme (the latter being no more than a repeated
period); or it might be regarded as the first codetta; its thematic
independence seems, however, to stamp it Second Subordinate theme.
Further, it is not uncommon to extend the sonatine-form by adding, at
the end, a more or less complete recurrence of the Principal
theme,--instead of, or dissolved into, the customary coda. This may be
seen in Mozart, pianoforte sonata, No. 3, Andantino; the superfluous
recurrence of the Principal theme begins in measure 19 from the end,
after the regular sonatine-design has been achieved, fully, though
concisely.