how to transpose music

Quite often you may find yourself looking at a fine piece of music which has been engraved beautifully but alas in in the wrong key...

Perhaps because you are playing a tuba (a transposing Bb-instrument) where the other band members are using non-transposing instruments (guitar, flute, piano etc.). Another day you may find that the vocalist will do a much better job when the entire piece would be played a few notes lower or higher.

Welcome to transposition.

First you should make clear what the desired key should be. Playing along with MusiCAD makes that quite an easy job. Let's first handle our aforementioned singer.

Open the score to be adjusted.
Adjust the pitch using [Options|Midi Setup|Shift MIDI out] increasing (or decreasing) the value by one ore two semitones at a time.
Save the change and play the tune with altered pitch.
Repeat the previous steps until you are satisfied with the changed pitch.
Knowing now how the pitch should be found (number of semitones up or down) it is easy to transpose the notes. Remember the setting of Shift MIDI-out, while restore the setting to zero.
Now go to the transpose dialog and adjust the key until you've reached the desired pitch-shift.

Above you see the original key C (no sharps/flats) and a target key F (one flat) resulting in a pitch shift 5 semitones up.
After you've hit the ok-button all notes are lifted 5 semitones and a flat is notated at the front of each line. All guitar chord symbols with the notes were transposed also, as well as chord symbols within a block of lyrics .

Ok, reading and playing music written in a key having one flat shouldn't be much of a problem, but what if we were to play using 5 or six sharps or flats. Our singer doesn't care, but violin players typically don't like lots of flats and Bb-clarinettists frown upon sharps... Such cases ask for compromises: use a next-to-ideal key by altering pitch one semitone up (+7 sharps/5 flats) or down (+5 sharps/ 7 flats) so you'll get a more 'playable' key.

Our tuba player needs a different solution. Whenever you are playing an instrument that has 'transposition' built in like clarinet, trumpet or tuba (all Bb-instruments) you can simply use the part modification dialog and select C to Bb to accommodate for the needed transposition. In fact the C to Bb modification will transpose the part two semitones up (adding two sharps/removing two flats) while at the same time instruct the part to sound two semitones lower (just like the tuba player does; he reads a C, plays a Bb, so give him a D and he can play along with real-pitched instruments like a piano).