III. One-Part Forms
One-part form -- A tonally closed musical
entity not divisible into smaller sections.
"Tonally closed" means "beginning and ending in the tonic,
exhibiting melodic and harmonic closure."
By this definition, all periods except for
those with modulating consequents are one-part forms. Other musical
units that do not satisfy the definition of period may nevertheless
be one-part forms.
A one-part form may be divided into
discrete phrases, but it lacks the contrasts of surface design
typical of multi-part forms (binary, rondo, etc.).
One-part forms are of two types: those
exhibiting harmonic interruption and those not exhibiting harmonic
A one-part structure with at least one
structural dominant serving to interrupt and restart the overall
tonal progression of the music.
Undivided One-Part Form
A tonally closed musical entity not
exhibiting structural interruption.
Examples from Burkhart:
Study these. Decide whether or not they
exhibit interruption. Find other one-part forms in the
Prelude No. 1 in C from Well-tempered
Clavier, Book I
All seven of the Preludes, Op. 28 given in
Burkhart exemplify one or the other sort of one-part form