The currentFile attribute represents the file that will be played by the player. Typically, you do not make a connection to this attribute but instead, tear it off. By tearing the attribute off, you gain access to information about the specific file such as the file name and the file's length.
For example, if you want to display the name of the file that the Audio Wave Player is playing, tear off the currentFile attribute. You now have access to the current file's attributes and you can connect the fileName attribute to the object attribute of a label part.