Index signature to get the track at the requested index in the list.
Add the given listener for the given event type(s).
The type of the event.
The callback which is executed when the event occurs.
Return the track at the requested index in the list.
A number
representing the index of a track in the list.
The track with index index
in the list.
Remove the given listener for the given event type(s).
The type of the event.
The callback which will be removed.
List of tracks.