Never in multi-player.

Single player very rarely. I dont like looking up guides either unless im absolutely stuck and ready to quit the game over it.

Im absolutely a person who does everything the hard way and looks down on anyone taking an easy road. To me it devalues people who actually do work hard (example, using auto tune/melodyne vs actually learning to sing. I dont care how transparent it is, its cheating and waters down the real talented singers out there).