Repairing recurring vocal parts or guitar riffs by creative editing

Let’s say you have a guitar riff or a repeating vocal part and one of them is perfect and the others not-so-much. Or, maybe the very first one is weak and you want to fix it by “flying” one of the more perfect ones…

Watch this video to see if this is not the EASIEST ways to make your client (or you!) nail their part every time!
Thanks for reading.