A significant keyboard sonata by the progressive Friedrich Wilhelm Rust. It is distinguished by its experimental harmonic turns and virtuosity that bridges the gap between C.P.E. Bach and Beethoven.
At Henle 6 this is an advanced piece that assumes fluent technique and rewards mature interpretation. The main demands: fast passage work that stays light and even at tempo; sweeping arpeggio figures that must stay smooth across positions; and precise articulation — the difference between crisp and blurred is the piece.
Beyond that, expect fine finger independence within the hand.
The fast scale passages and rapid shifts in register require precise finger control.
Comparable difficulty and character — good candidates for what to learn next.
A level or two down with the same spirit — ideal if this piece is still out of reach.
Where this piece's skills lead: slightly harder works making similar technical demands.
Clavichord Sonata in G major is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Clavichord Sonata in G major lasts about 6 minutes.
Clavichord Sonata in G major is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Fantaisie-Impromptu in C-sharp minor by Frédéric Chopin, Rondo capriccioso in E major by Felix Mendelssohn, Rondo a capriccio in G major by Ludwig van Beethoven — see the full similar-pieces list on this page.