Featured Comparisons — SPICY

Clean overview chart now uses a consistent index across all pairs (not “avg of first 2 axes” when the axes differ). Bubble size scales more aggressively with risk.

Overview: where the difficulty lives

Bubble size ≈ risk (scaled harder). Left→right = more mechanics load. Bottom→top = more texture/artistry load.

Overview bubble map

Mechanics index uses a consistent mapping (speed/endurance/leaps/contortion/chord violence), not pair-specific axis positions.

Chopin Ballade No. 1 (Op.23) vs Étude Op.10 No.12 “Revolutionary”

Story-form volatility vs left-hand storm endurance.

Frédéric ChopinFrédéric Chopin
🔥 If “hard” means *what breaks hands*, Revolutionary wins. If “hard” means *what breaks performances*, Ballade No. 1 is the nastier trap.

Hard facts (quick receipts)

  • Henle difficulty: Both are rated level 8 (“difficult”) in Henle’s system.
  • Ballade g minor: Composed 1835, first published 1836.
  • Revolutionary Étude: Published 1833 (cycle Op.10).

Why pianists fight about it

  • Ballade No. 1 sounds “narrative,” so people underrate how many *structural* ways it can implode when nerves spike: pacing, climaxes, coda aim.
  • “Revolutionary” looks like “left hand go brr,” so people over-index on arm fatigue and forget the right-hand theme has to *lead* and *sing*.

Technical hotspots (the actual deciders)

  • Ballade: the coda: Leap‑landing precision under adrenaline; right-hand can’t flinch on landing or the whole thing smears.
  • Ballade: long‑range form: Rubato choices early determine whether the piece has somewhere to grow—this is cognitive load, not just fingers.
  • Revolutionary: LH stream: Evenness *and* power without locking the wrist; manage lateral motion so it’s not a repetitive‑strain factory.
  • Revolutionary: RH theme: Melody must project cleanly over the LH roar; if you tense to get volume, the line dies.

Biomechanics (failure modes)

  • Ballade No. 1: Failure mode is often **aim + decision fatigue**: constant re-targeting of voicing and jumps.
  • Revolutionary: Failure mode is often **endurance + tension spiral**: sustained fast LH motion encourages tightening unless the arm carries weight efficiently.
Ballade No. 1 — Velocity ceiling 7.6, Endurance/forearm load 7.1, Big‑leap accuracy 8.4, Voicing & texture control 9.4, Form/cognitive risk 9.2
Revolutionary — Velocity ceiling 8.0, Endurance/forearm load 9.3, Big‑leap accuracy 6.4, Voicing & texture control 7.4, Form/cognitive risk 6.8
Sources used for the receipts

Difficulty fingerprint

Radar chart

Read it like a heat signature: high on Mechanics = body tax; high on Texture = mind+ear tax; high Risk = stage tax.

Beethoven “Moonlight” Sonata (Mvt. III) vs Chopin Fantaisie‑Impromptu (Op.66)

Motor clarity vs polyrhythmic independence.

L. van BeethovenL. van Beethoven
Frédéric ChopinFrédéric Chopin
🔥 Moonlight III is harder to keep *clean at concert tempo*. Fantaisie‑Impromptu is harder to make sound *effortless and non‑exercise‑like*.

Hard facts (quick receipts)

  • Fantaisie‑Impromptu dates: Composed 1834; published posthumously 1855.
  • Perception gap: Both are ‘famous hard,’ but difficulty lives in different failure modes (clarity vs coordination).

Why pianists fight about it

  • Moonlight III exposes you: too much pedal = blur; too little = brittle. Keeping it brilliant but clean at tempo is a public‑risk test.
  • Fantaisie‑Impromptu’s 4‑against‑3 coordination tax is real: people can play the notes yet still sound uneven or mechanically “practiced.”

Technical hotspots (the actual deciders)

  • Moonlight III: perpetual motion texture: The piece punishes any unevenness—tiny bumps read as panic.
  • Moonlight III: accent shaping: Accents must be musical (phrase) not mechanical (muscle).
  • Fantaisie‑Impromptu: 4:3 alignment: Two clocks: RH groups of four against LH triplets; must feel one pulse underneath.
  • Fantaisie‑Impromptu: evenness at speed: Listeners hear bumps instantly; the real skill is smoothing transitions between finger groups.

Biomechanics (failure modes)

  • Moonlight III: Sustained finger repetition → forearm endurance and tension management.
  • Fantaisie‑Impromptu: Independence → nervous-system timing; stiffness shows up as ‘lurching’ alignment.
Moonlight III — Motor speed 9.1, Evenness/clarity 8.6, Hand independence 7.1, Pedal discipline 8.2, Stamina 8.6
Fantaisie‑Impromptu — Motor speed 8.0, Evenness/clarity 8.1, Hand independence 9.1, Pedal discipline 7.2, Stamina 7.1
Sources used for the receipts

Difficulty fingerprint

Radar chart

Read it like a heat signature: high on Mechanics = body tax; high on Texture = mind+ear tax; high Risk = stage tax.

Ravel “Scarbo” (Gaspard de la nuit) vs Balakirev “Islamey”

Quiet terror engineering vs high‑octane virtuoso brawl.

Maurice RavelMaurice Ravel
Mily BalakirevMily Balakirev
🔥 Islamey is the knife fight. Scarbo is the sniper test—quiet, precise, designed to make you miss.

Hard facts (quick receipts)

  • Famous claim: Ravel intended Scarbo to be more difficult than Islamey (widely cited).

Why pianists fight about it

  • Both are ‘Everest’ symbols. Islamey is a straight-up speed + pattern brutality benchmark.
  • Scarbo is *quiet difficulty*: fast, low-dynamic control + sudden shape shifts—harder to fake.

Technical hotspots (the actual deciders)

  • Scarbo: quiet repeated notes: Soft repeated-note control is harder than loud; any unevenness sounds like a malfunction.
  • Scarbo: lightning jumps + flashes: Micro‑precision alternates with large arm moves. Miss one landing and the illusion breaks.
  • Islamey: continuous velocity: Fast passagework with hand-shape flips demands steel rhythm; tempo sag is instantly obvious.
  • Islamey: endurance spikes: When you’re already tired, it asks for more speed—classic ‘late‑piece betrayal.’

Biomechanics (failure modes)

  • Scarbo: Fast switching between tiny finger actions and large arm moves → neuromuscular ‘gear shifting.’
  • Islamey: Sustained high-speed work → horsepower + stamina, with fewer ‘reset’ moments.
Scarbo — Reflex demand 9.6, Quiet control 9.6, Hand contortion 8.5, Rhythmic volatility 9.0, Derailment risk 9.6
Islamey — Reflex demand 9.0, Quiet control 7.4, Hand contortion 8.0, Rhythmic volatility 7.6, Derailment risk 8.1
Sources used for the receipts

Difficulty fingerprint

Radar chart

Read it like a heat signature: high on Mechanics = body tax; high on Texture = mind+ear tax; high Risk = stage tax.

Liszt Réminiscences de Don Juan (S.418) vs Réminiscences de Norma (S.394)

Headline virtuosity vs texture-and-voicing suffocation.

Franz LisztFranz Liszt
🔥 Don Juan is the headline. Norma is the slow drowning—more minutes with zero safe autopilot.

Hard facts (quick receipts)

  • IMSLP pages: Both works have dedicated IMSLP entries for editions and metadata.

Why pianists fight about it

  • Don Juan has the meme aura: glitter, speed, chromatic thirds. It’s the piece people name first.
  • Norma is the connoisseur monster: denser textures and more pages where voicing decisions are life-or-death.

Technical hotspots (the actual deciders)

  • Don Juan: chromatic thirds + webs: Finger independence at extreme speed; tension creeps in when you ‘chase’ notes laterally.
  • Don Juan: synchronized jumps: Both hands have to land together with orchestral certainty—no “close enough.”
  • Norma: layered singing: Melody + inner voices + bass architecture must be shaped simultaneously.
  • Norma: anti‑fog pedaling: If you pedal like Chopin, it becomes blur; clarity requires calculated, changing pedal strategy.

Biomechanics (failure modes)

  • Don Juan: High-speed finger mechanics + lateral motion management (avoid twisting).
  • Norma: Sustained voicing across thick chords → hand-span politics + long-duration control.
Don Juan — Peak ceiling 9.6, Textural density 8.6, Leaps/chord violence 9.1, Voicing across layers 8.6, Endurance 9.1
Norma — Peak ceiling 9.3, Textural density 9.6, Leaps/chord violence 8.6, Voicing across layers 9.6, Endurance 9.2
Sources used for the receipts

Difficulty fingerprint

Radar chart

Read it like a heat signature: high on Mechanics = body tax; high on Texture = mind+ear tax; high Risk = stage tax.