Pitch
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b. 47-50
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composition: Op. 28 No. 17, Prelude in A♭ major
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As in the previous four-bar section, accidentals in A (→FE) are written inaccurately – 9 sharps are missing. In FC Fontana added one of them, yet overlooked the category imprint: Interpretations within context; Differences between sources issues: EE revisions , Accidentals in different octaves , GE revisions , Errors of FC , Fontana's revisions , Inaccuracies in A , Errors repeated in FE |
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b. 47
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composition: Op. 28 No. 17, Prelude in A♭ major
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In FCI there are no ornaments before the 4th R.H. quaver. Moreover, from the 2nd quaver on, the R.H. part is written down using two-part notation – melody in the top voice, while dyads in the bottom one. category imprint: Differences between sources; Corrections & alterations; Source & stylistic information issues: Main-line changes |
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b. 49
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composition: Op. 28 No. 17, Prelude in A♭ major
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In the chord on the 4th quaver in the bar, FCI includes an additional note (c category imprint: Differences between sources; Corrections & alterations; Source & stylistic information issues: Corrections in A , Deletions in A , Accompaniment changes |
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b. 50
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composition: Op. 28 No. 17, Prelude in A♭ major
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FE overlooked the category imprint: Interpretations within context; Differences between sources issues: Annotations in teaching copies , EE revisions , Errors in FE , Annotations in FED , Annotations in FES |
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b. 50-51
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composition: Op. 28 No. 17, Prelude in A♭ major
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In FCI the structure of all the accompanying quavers in b. 50 (from the 2nd to the 6th) is similar – 3 notes each in the part of each of the hands, hence c category imprint: Differences between sources; Corrections & alterations; Source & stylistic information issues: Accompaniment changes , Bass register changes |
before the middle note of the 2nd L.H. quaver in b. 47. A comparable number of deficiencies are to be found also in 
2). The fact that it was crossed out in 
before the minim at the beginning of the bar (a