We developed eight types of variations for real-time transcribed excerpts:
a) altering pitch content: string inversion, string mirroring, string shuffle, imposing a pitch-class set;
b) altering rhythm: retrograde based on onsets, retrograde based on offsets, rhthymic shuffle;
c) altering the order of pitches: fret shuffle.
Examples of rhythmic alterations using a short Bach’s phrase (ten first notes from fugue E minor, WTK I)
Waveforms
Audios:
original phrase
retrogradation (offsets -> onsets)
retrogradation (onsets -> onsets)
rhythm shuffle
fret shuffle
Examples with alterations of pitch
string inversion
(lower strings to higher, and vice-versa)
Villa-Lobos – beginning of Study 4
original
variation
——
Solo from introduction of I wish you were here
original
variation
——
Vaneira accompaniment
original
variation
string mirroring
(lower frets to higher, and vice-versa)
Villa-Lobos – beginning of Study 12
original
variation
——
Villa-Lobos – beginning of Study 4
original
variation
——
Leo Brouwer – beginning of Study 6
original
variation
string shuffle
L. Brouwer – Pastoral, from Sonata 1990, 1st mov.
original
variation
——
Oasis – Introduction of Wonderwall
original
variation
——
Garoto – Introduction from Lamentos do Morro
original
variation
forcing a pitch-class set
J. S. Bach – beginning of Allegro
original
variation
——
Villa-Lobos – slur section from Study 10
original
variation
Examples with alterations of rhythm
retrogradation (offsets -> onsets)
L. Brouwer – beginning of Study VI
original
variation
——
Morendo, from Sonata 1990, 2nd mov.
original
variation
retrogradation (onsets -> onsets)
L. Brouwer – Morendo, from Sonata 1990, 2nd mov.
original
variation
rhythm shuffle
L. Brouwer – beginning of 3rd mov. from Sonata 1990
original
