Different singers sing different keys. Studio can transpose any song's chord chart on the fly without changing the master.
Per-plan transpose
When you add a song to a plan, you pick the key for this performance. The chord chart on the share link displays in that key. Pick a different key next week — the song record never changes, only the plan does.
Per-arrangement transpose
If you regularly play a song in a key that isn't the master, create an arrangement for it. Arrangements are saved alternate versions with their own key + chord chart + notes. Pick the arrangement when adding the song to a plan.
Preview before saving
Click Preview key on any song or arrangement to see the chord chart in a different key before committing. Useful for finding the right key for a new vocalist.