PROJECT TWO: Two-Part Invention

Using the technique of invertible counterpoint, invert, transpose, and develop a single basic two-part theme into a full-fledged form. Model your work after the four Bach examples discussed in class and in labs, and incorporate feedback given on your sequence assignment (Week 5) and invention-practice phrase assignment (Week 6).

Your composition can take any of several overall forms, including but not limited to:

PHRASE 1: 4-8 bars, melody with counterpoint, tonicizing V, v, i, or III with a weak cadence.

PHRASE 2: a transposition of phrase 1, with bass and treble parts switched. Begin with a tonicized key related to the end-point of phrase 1. Modify the cadence to tonicize a new related key, or return to the tonic.

SEQUENCE: based on a fragment of phrase 1, 4-6 bars in length, reaching a cadence in a key opposite the mode of the tonic.

PHRASE 3: a third version of the basic phrase, in the key reached by the sequence (opposite the mode of the tonic), possibly extended 1-2 bars in additional length, or intensified through a widened or contrasting range.

SEQUENCE: based on the same fragment as the first sequence, moving as necessary to return to the tonic.

PHRASE 4: restatement of the first phrase in its original key, and ending on the tonic with a stronger, more conclusive cadential ending.