Amazing Grace is Public Domain no Copyright same as the others Traditional ones.
Save the midi to a wav with Ctrl+A then drag it up to the wav drop then out to a folder then drag it back in to RB to 3 or 4 new tracks then add a different amount of reverb FX to each track and a bit of panning then render them down to 1 stereo wav, Render > Merge Audio&VSTi to Stereo wav.