Pick the concert pitch. Every instrument shows the note it reads. Built to be read from the podium at a glance, not studied.
The board above answers “what do I read.” These answer “why” — one page per instrument, with the concert-to-written table for every key.
Flute and oboe read concert pitch in treble clef; bassoon, trombone, euphonium and tuba read concert pitch in bass clef. The piccolo also reads concert pitch, but sounds an octave higher. Everything else on this chart transposes.
D. A B♭ trumpet sounds a major second lower than written, so its part is written a major second above concert pitch. Choose any concert pitch on the chart above and every instrument's written note changes with it.
The alto saxophone is in E♭ and sounds a major sixth lower than written, so its part is written a major sixth above concert pitch. The flute reads the sounding note. Both players produce the same pitch from different notation.
A major ninth — an octave plus a major second. The bass clarinet sounds a major ninth lower too, and the baritone saxophone sounds an octave and a sixth lower.
Bassoon, trombone, euphonium and tuba — all four at concert pitch. Every other instrument here reads treble clef.