BlueLab Wav3s is a plugin that simply displays the sound in 3D. Several display modes are available, as well as parameters to adjust the display. The view is interactive and can be easily manipulated using the mouse or the trackpad. Technically, this kind of view is called a waterfall plot.
The free BlueLab Wav3s plugin is included in the Free Bundle.
You might be interested in the following tutorial: How To Understand a Spectrogram?