If this is your first time running muso, the first thing you will need to do before you can start browsing your albums is to set up your Music Database. You will need to configure your music sources via the Options window , and once these have been set up you can then use the Import options on the toolbar to load your initial music database, and (if necessary) susequently update it incrementally. Importing from iTunes or SqueezeBox Server will pull in all the track attributes it can, and importing from a folder will read all the track tags from the track meta-data that it can, but please note that some attribute editing may be required in muso for the imported tracks.
Track editing is made easy in the Music Database page, which provides a detail grid of tracks and their attributes: you can edit in the grid but much more powerful is the ability to select multiple tracks (via control-click or shift-click) and choosing the "Edit Selected Tracks" option. In the Edit Tracks window, attributes with a blue background are those which do not have the same value in all the selected tracks (though any common prefix is shown), and attributes with a pink backround are those that you have edited which will be written back to all the selected tracks (those you do not edit explicitly will be left alone). Note that editing the attributes in the muso database does not attempt to write meta-data back to the files themselves.
Each user of muso (on the same machine) can specify in the Options whether to use a personal database, or a shared database (available to all users).
A note on album collation: albums are collated from the track database by pulling together tracks with the same album name, plus either their location (when you have ensured that album tracks are stored in their own folders) or a combination of other attributes. This is driven by the option you choose as detailed track level: