Tracks
From Audacity Manual
Anything that is added to your project will be placed inside a track container, underneath the timeline of the project. These are the different types of tracks:
Audio tracks contain digitally sampled sounds:
Label tracks contain labels which mark specific points or selection areas in the project:
Time Tracks allow you to gradually speed up or slow down playback of all audio tracks in the project over time:
Note Tracks display data from MIDI files:
