https://www.puremix.com/library/tutorials/interviews/how-to-tune-vocals-with-melodyne

Vocals are the heart & soul of a song. Because if this, it is essential that you learn to treat them with the detailed attention they deserve. Melodyne is a powerful tool that allows you to tweak a singer's (or instrument) performance to a tasteful amount of perfection. But like any powerful tool, it can be confusing and overwhelming. No need to worry, Fab’s got your back. Follow along as he shares his refined approach to using Melodyne in the most musical way possible.