Everybody Else for contest on Our Stage

Me Justine Vickery adding Vox and lyric's to T-Pains song Everybody Else for contest on Our Stage... All the vox layer's such as harmonies I have done wich I only added a litte reverb to... I wanted to add my keyboard sound to this song for it added flavour to it. I did not add it though for I did not know if it was ok to do so in this contest... If it is ok please tell me.....