Load the song project into your DAW and change the tone. Depending on what you're mixing, you may need to use an add-on. In ProTools, you can simply use the built-in Elastic Audio feature. It allows you to change the pitch (octaves and cents) of each track, as well as each clip of a track, individually, without affecting the tempo.
For every combination you try, repeat steps 1 to 3, this time you may get results. Musical plagiarism is the use or close imitation of another author's music while representing it as one's own original work. Plagiarism in music now occurs in two contexts: a musical idea (i.e., a melody or motive) or a sampling (taking part of a sound recording and reusing it in another song). For a legal history of the latter, see the sampling.
What we mean is that if you release a song with a melody that someone has already thought of, you can be sued, especially if your song gains ground.