There are many factors to consider when choosing the most appropriate key for a song. Vocalists especially know the importance of choosing the right key for their unique voice. But we also need to consider the “audience” and the explicit purpose of singing the song in the first place!
Some, I am sure, will disagree with me on this issue. That’s okay. It’s not my intention to present a hard set of rules that must be applied in every situation. But in most situations, this flowchart will be a helpful tool as you make your key choice decisions.