When cleaning music, TuneUp will group results based on confidence level (Matches vs. Likely Matches), and within each of these, TuneUp will show you the album and also provides you with the track listing.
View the track listing for any album by clicking the gray arrow next to the album art.
The results in bold (like Corriander, in the example above) reflect matches for files that you dragged into TuneUp. The results in gray, are those that could potentially be missing from your music collection.
Click the arrow next to any grayed out track listing to buy it (or the entire album) from the iTunes Music Store. This way, TuneUp can help you fill in the holes of your total music collection. Know immediately which tracks are absent off your favorite albums!