Tracks - Audacity
Tracks > Add new > Audio track, Stereo track, Label track, or Time track
Track Control Panel
Click on the black arrow to view a pull down list of options for each track - allows you to rename the track, provides sample information, waveform view, spectrogram view, mute or solo the track, increase volume and pan left-right function.
Waveform view: vertical axis represents amplitude or loudness and the horizontal axix represents time.
Spectogram view:the horizontal axis represents time, the vertical axis is frequency; a third dimension indicating the amplitude of a particular frequency at a particular time is represented by the intensity or colour of each point in the image.