A [[Tie]] connects two notes of the same pitch and name, indicating that they have to be played as a single note.
Can contain tie directions at certain note indices. For example, if it contains {2: PlacementEnum.Below}, then the tie should go downwards from Tie.Notes[2] onwards, even if tie.TieDirection is PlacementEnum.Above (tie starts going up on Notes[0]).
Optional
A [[Tie]] connects two notes of the same pitch and name, indicating that they have to be played as a single note.