Outliers: The Story of Success · chapter 2 · id outliers-c2-09-mozarts-earliest-compositions-
“Mozart's earliest compositions (before age 10) are now regarded by musicologists as derivative works heavily arranged by his father Leopold, not evidence of innate compositional genius. His first masterwork, Piano Concerto No. 9, came at age 21 after roughly 10 years of composition.”
TRUE, BUTconfidence: medium⚠ extracted by pipeline, re-audit pending
Receipts
Smithsonian Magazine: Mozart: In Search of the Roots of Geniussource alive
Most of the music Mozart wrote at the early stage of his career is little known today and is influenced strongly by its models. The 19th century mythologized Mozart's compositional process.
Morningside Music Academy: Was Mozart Really A Genius?source alive
Friedrich Rochlitz propagated anecdotes about Mozart that were long assumed authentic but are now widely doubted. Early compositions show heavy influence of Leopold Mozart's corrections.
This claim is a stable, citable object. If you can falsify a verdict, tell us. Corrections are loud here.