Here are ways to see information about an audio track:
To see information about audio in a slideshow, hold the pointer over the audio well in the slideshow editor (shown below).
After a brief pause, the audio track information appears.
To see information about audio in a menu background, hold your pointer over the menu (with no buttons or text objects selected) and press Command-I to open the Menu Info window.
The audio track information is listed next to the audio well.