Rapping over backing vocals
Rapping over backing vocals is the crutch of a live performance. Performing on-top of your vocals is like swimming with a life jacket, there is no fear of drowning so you never truly give it your all. Rapping your verses with precision time and again is what separates mediocre rappers from legends.
Rappers like Danny Brown and Kendrick Lamar spit each bar with a ferocity and don't rely on the backing track to save them, so why can’t you?