Is there a program that can transpose music?
Simply download ScanScore and use your smartphone, tablet or a scanner to scan your sheet music and play it back to you. And you can just as easily transpose your score, export your notes to almost any music program and edit them further.
Is it legal to transpose music?
Transposing (including transposing using software such as Sibelius) is not considered to be an arrangement so long as the melody is not altered in any manner. ... It's also worth noting that guitar chords are not considered to be a music arrangement and can be used without any additional permission.