I imagine it is simple as prefixing the entire piece with the instructionConsider a piece written in the key of D-major. It can be transposed up to E-major; note that the key signature is automatically transposed as well.
\transpose d e {
\relative {
\key d \major
d'4 fis a d
}
}
[image of music]
\transpose d f (
)
\paper
{
#(set-paper-size "letter")
top-margin = 1.7 \cm
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