There are mainly two advantages to using "listenTo()" instead of using "on()" to bind event handlers. See the syntax of using these both because they are used differently :
Syntax :
listener.listenTo(object, event, callback)
object.on(event, callback)
While using "listenTo()", the object whose events you want to listen to is passed as the first argument. On the other hand, in the case of "on()", it is a method on that object.
The key advantages of "listenTo()" over "on()" are :
* The listener keeps track of all the event handlers, making it easier to remove them all at once when required.
* The callback's context is always set to the listener itself.
