A slight aside.
Jon Freeman's web site Folkinfo.org recently introduced a section where you can input ABC format tunes and it will (amongst other things) print out the dots. It will also take your input and transpose it up or down by a selected number of semitones, so if you needed sheet music for a pianist playing in concert pitch and also for a clarinet in B flat, you could print out two sets of dots but with different keys.

Note :-
To match the note coming out of an instrument in B flat to one in C, you would need to print a score two semitones higher for the B flat instrument.

Quack!
Geoff.