You must be able to spell a chord instantly. For example: F7 = F, A, C, Eb. If you see F7alt, you need to know the altered tensions (b9, #9, b13). If you can't spell the chord, you cannot sight read the chart.
: The golden rule of sight reading is to never stop for a mistake. If you miss a note, leave it in the past and focus on the next beat to stay synchronized with the time. Recommended Resources and Books
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In ensemble reading, identify the rhythmic "hits" shared by the brass section. These must be played with more weight and clarity than melodic filler. III. Articulation: The "Doo-Dot" Language