Grades in piano abilities

[Carlo]

Hi!

In a website selling musical scores I have found this classification of the difficulties while playing piano.
It is meant to give advice to the piano player when choosing a piece to study (and buy):


*************** START OF THE CLASSIFICATION **************

0th Level: Early Elementary
Hand Positions and Scales:
- Very beginning music
- Five-finger patterns
- Almost no hand position movement
Chords and Rhythms:
- No chords
- Quarter, half, and whole notes

1st Level: Elementary
Hand Positions and Scales:
- Five-finger patterns with a little hand movement
- Simple hands-together playing
Chords and Rhythms:
- Some 3-note chords
- 1 chord per measure
- Quarter, half, dotted half, and whole notes, some eighth notes

2nd Level: Late Elementary
Hand Positions and Scales:
- Limited hand movement, some hand position changes and finger extensions
Chords and Rhythms:
- 3-note chords
- More than 1 chord per measure
- Quarter, half, dotted half, and whole notes, and eighth notes

3rd Level: Early Intermediate
Hand Positions and Scales:
- Independent movement of the left hand
- Hands in parallel and contrary motion
Chords and Rhythms:
- Multiple chords in a measure
- More variety of chords
- Eighth to whole notes, triplets, dotted rhythms

4th Level: Intermediate 1
Hand Positions and Scales:
- Scales moving up and down the keyboard at a faster tempo
- Arpeggios covering 2 octaves
Chords and Rhythms:
- Many chords, some 4-note
- More complex rhythms
- Sixteenth notes

5th Level: Intermediate 2
Hand Positions and Scales:
- Scale passages over several measures
- Melodies may be in both hands
Chords and Rhythms:
- More variety of chords including seventh chords
- More complex rhythms, including sixteenth notes and dotted rhythms

6th Level: Late Intermediate 1
Hand Positions and Scales:
- Longer scale passages, some in octaves
- Melodic lines in both hands
Chords and Rhythms:
- Full four note chords in both hands, requiring large hand stretches, large leaps
- Irregular rhythmic groups between the hands
- More complicated patterns

7th Level: Late Intermediate 2
Hand Positions and Scales:
- Scales in octaves in both hands
- Melody and accompaniment in same hand
Chords and Rhythms:
- Full four- to five-note chords in both hands
- Large leaps and broken octaves
- Polyrhythms and complex rhythmic patterns

8th Level: Early Advanced
Hand Positions and Scales:
- Scales in 3rds, 10ths and octaves, whole tone scales and modes
- Intricate melodic lines
Chords and Rhythms:
- Four- and five-note chords spanning more than an octave, rolled chords in 10ths
- Intricate rhythms

9th Level: Advanced 1
Hand Positions and Scales:
- Extensive scale passages incorporated into pieces with active accompaniment patterns
Chords and Rhythms:
- All types of major, minor, diminished and augmented chords spanning more than an octave
- Intricate rhythms
- Complex meter

10th Level: Advanced 2
Hand Positions and Scales:
- Intricate melodic lines often requiring extremely fast tempos
Chords and Rhythms:
- Complex broken-chord patterns, full chords, and large hand extensions
- More complicated polyrhythms
- Complex meter
- Complicated melodic figures

***************** END OF THE CLASSIFICATION ***************

What do you think about it ?

I remember that sometimes in the User Group we dealt with the topic of the various existing ways of classifying musical abilities according to the public educational systems.

Is there a classification that can be considered a "standard" or is "de facto" widely accepted, possibly at international level ?

Best regards,