Blah is a minimalist-influenced etude by Frederic Rzewski, defined by its obsessive repetition and rapid-fire changes in dynamic intensity. The piece functions as a study in endurance and precise control over rapid-fire rhythmic groupings.
The piece requires extreme finger independence and rhythmic endurance during the relentless moto perpetuo passages.
Comparable difficulty and character — good candidates for what to learn next.
Blah is rated Henle level 8 of 9 — concert repertoire, roughly diploma level. In the RCM system it corresponds to about level 10.
You should be comfortable at Henle level 8 — meaning you can already play level 7–8 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 Blah lasts about 3 minutes.
Blah 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 Cadenza con o senza Beethoven by Frederic Rzewski, Ballade No. 5 (It Makes a Long Time Man Feel Bad) by Frederic Rzewski, Ballade No.5 by Frederic Rzewski — see the full similar-pieces list on this page.