In bagpipe music, the low A note is tuned really close to concert B-flat, where concert A is 440Hz. So if you are looking for a version of Mary Had A Little Lamb for a concert (orchestral) band instrument you will need to do some transposing of this version if you intend to play along with a piper. For the flute or oboe, raise the notes here 1 semi-tone. The Trumpet and Clarinet would be 3 semi-tones. For the trombone, raise 1 semi-tone, and then drop it 1 octave.