Real musical phrases, not random notes
Every exercise is built as a period or sentence — a basic idea that returns, a question-and-answer shape, a half cadence in the middle and a full close at the end. It reads like music because it is structured like music (after Schoenberg and Caplin), never a random walk across the staff.
Graded 1–6, the way syllabi grade
Keys, meters, rhythms, tempo, and expression widen level by level along a ladder modelled on graded sight-reading standards (ABRSM-style). Level 1 stays in one sharp or flat and simple time; by level 6 you are reading every key, syncopation, triplets, and asymmetric meters.
Your instrument, your range
Pick from flute, clarinet, sax, trumpet, trombone, violin, cello, piano, or voice. Exercises stay inside that instrument’s comfortable written range for your level — never an unplayable note — and transposing instruments are notated correctly and played back at concert pitch.
Expression that belongs there
Dynamics, crescendos, slurs, and articulations are introduced on the same graded schedule and placed to stay legible — accents and staccatos on the notehead side, clear of the slurs. You practise reading the marks, not just the pitches.
Hear it on a real instrument
Play any exercise back with sampled acoustic instruments, or set a plain metronome click and read it yourself. Adjust the tempo, use a count-in, and check your reading against the playback.
Endless, and impossible to memorize
The generator is deterministic — the same settings and seed always give the same piece — but every new exercise is fresh. You can’t run out of material or quietly memorize the book, which is the whole failure mode of static sight-reading collections.