TSRPR 5 (Metrical Stability)
In choosing the head of a time-span T, prefer a choice
that results in more stable choice of metrical structure.
TSRPR 6 (Prolongational Stability)
In choosing the head of a time-span T, prefer a choice
that results in more stable choice of prolongational
reduction.
TSRPR 7 (Cadential Retention)
If the following conditions obtain in a time-span T,
then label the progression as a cadence and strongly
prefer to choose it as a head:
i. There is an event or sequence of two events
(e1)e2 forming the progression for a full, half, or
deceptive cadence. *
ii. The last element of this progression is at the
end
of T or is prolonged to the end of T.
iii. There is a larger group G containing T for which
the progression can function as a structural
ending.
TSRPR 8 (Structural Beginning)
If for a tome-span T there is a larger group G con-
taining T for which the head of T can function as the
structural beginning, then prefer as head of T an
event relatively close to the beginning of T (and hence
to the beginning of G as well).
TSRPR 9 *
In choosing the head of a piece, prefer the structural
ending to the structural beginning.
Prolongational PRWFR 1
Reduction There is a single event in the underlying grouping
structure of every piece that functions as prolon-
gational head.
PRWFR 2
An event ei can be a direct elaboration of another
event ej in any of the following ways:
a. ei is a strong prolongation of ej if the roots, bass
notes, and melodic notes or the two events are
identical.*
b. ei is a weak prolongation of ej if the roots of the two
events are identical but the bass and/or melodic
notes differ. *
c. ei is a progression to or from ej if the harmonic
roots of the two events are different. *
PRWFR 3
Every event in the underlying grouping structure is
either the prolongational head or a re-
cursive elaboration of the prolongational head.
PRWFR 4 (No Crossing Branches)
If an event ei is a direct elaboration of an event ej,
every event between ei and ej must be a direct elabo-
ration of either ei, ej, or some event between them. |