OK, I THINK I am following you now. Ok, so music is in C, written for a C instrument, we should have two sharps (D) when transposing for a Bb trumpet right? So Bb is down the page from C, and we're starting from C with an instrument pitched in C, so we'll go from top to bottom, but be reciting in reverse order (clockwise on the circle of fifths) C - C <start here> f - G Bb - D <stop here> Eb Ab Db F# B E A D G If we were transposing for a Pic (in A) from an Oboe in C, and the piece were written in in Eb, A is down the page from C so we are still reciting clockwise on the Cirle of fifths - beginning this time on Eb C - Eb F - Bb Bb - F Eb - C Ab - G F# - D B - A E - E A - B (five sharps) D G So the key becomes B? Probably not a good choice to use an A, we could have had one flat if we'd chosen a Bb Pic? Is that right? So that would help you choose which insturment to use??? You still have to figure out how many lines/spaces to adjust by though right . . .? It all seems pretty tough to do in the head. But for transcribing, it seems helpful. Or did I misunderstand?