The track browser

When Ask the DJ is launched, your local volumes are searched for .mp3 and .m4a (AAC) files. The results are displayed in the track browser. The track browser shows track information such as title, artist, album, etc. Tracks can be sorted by any column.

the track browser

Note: If the track browser only displays a progress bar, then your volumes are still being searched for music.
See also: adding tracks