This is a question for MusicBee users with some understanding of, and interest in classical music.
(But it probably also has relevance to rock-opera's and other constructions of musical works.)
The discussion on tagging classical music (not only within MusicBee, but also at other software and websites) seems to focus on (and limits itself to) the additional tagging fields 'work' and 'movement'.
For a lot of classical music that is perfectly adequate. For example most symphonies are constructed that way.
But e.g. for opera this will not always cover the structure of the whole work.
Let's take a couple of tracks from a release of Purcell's "Dido and Aeneas" as an example:
01 - Dido and Aeneas, Overture
The First Act
02 - Dido and Aeneas, Act I, Scene: The Palace: "Shake the cloud from off your brow" (Belinda)
03 - Dido and Aeneas, Act I, Scene: The Palace: Chorus "Banish sorrow, banish care"
04 - Dido and Aeneas, Act I, Scene: The Palace: "Ah! Belinda, I am pressed with torment" (Dido)
05 - Dido and Aeneas, Act I, Scene: The Palace: "Grief increases by concealing" (Belinda, Dido)
06 - Dido and Aeneas, Act I, Scene: The Palace: Chorus "When monarchs unite, how happy their state"
07 - Dido and Aeneas, Act I, Scene: The Palace: "Whence could so much virtue spring?" (Belinda, Dido)
08 - Dido and Aeneas, Act I, Scene: The Palace: Chorus "Fear no danger to ensue" (Belinda, Second Woman)
09 - Dido and Aeneas, Act I, Scene: The Palace: "See, your royal guest appears" (Aeneas, Belinda, Dido)
10 - Dido and Aeneas, Act I, Scene: The Palace: Chorus "Cupid only throws the dart"
11 - Dido and Aeneas, Act I, Scene: The Palace: "If not for mine, for empire's sake" (Aeneas, Belinda)
12 - Dido and Aeneas, Act I, Scene: The Palace: Chorus "To the hills and the vales"
13 - Dido and Aeneas, Act I, Scene: The Palace: The Triumphing Dance
The Second Act
14 - Dido and Aeneas, Act II, Scene I: The Cave: "Wayward sisters, you that fright" (Sorceress) / Chorus "Harm's our delight"
15 - Dido and Aeneas, Act II, Scene I: The Cave: "The Queen of Carthage, whom we hate" (Sorceress) / Chorus "Ho Ho Ho!"
16 - Dido and Aeneas, Act II, Scene I: The Cave: "Ruined ere the set of sun?" (Sorceress, Two Witches) / Chorus "Ho Ho Ho!"
17 - Dido and Aeneas, Act II, Scene I: The Cave: "But ere we this perform" (Two Witches)
18 - Dido and Aeneas, Act II, Scene I: The Cave: Chorus "In our deep vaulted cell"
19 - Dido and Aeneas, Act II, Scene I: The Cave: Echo Dance of Furies
20 - Dido and Aeneas, Act II, Scene II: The Grove: Ritornelle
21 - Dido and Aeneas, Act II, Scene II: The Grove: Chorus "Thanks to these lonesome vales" (Belinda)
22 - Dido and Aeneas, Act II, Scene II: The Grove: "Oft she visits this lone mountain" (Second Woman)
23 - Dido and Aeneas, Act II, Scene II: The Grove: "Behold, upon my bending spear" (Aeneas, Dido)
24 - Dido and Aeneas, Act II, Scene II: The Grove: Chorus "Haste, haste to town" (Belinda)
25 - Dido and Aeneas, Act II, Scene II: The Grove: "Stay, Prince, and hear great Jove's command" (Aeneas, Spirit)
I am struggling a bit to decide on how this could be handled best in relation to decide on what the 'movements' are here exactly.
It is clear that "Dido and Aeneas" is the 'Work'.
But what are the movements?
From this example, are there:
3 movements:
1. Overture
2. The First Act
3. The Second Act
4 movements:
1. Overture
2. The First Act: Act I, Scene: The Palace
3. The First Act: Act II, Scene I: The Cave
4. The First Act: Act II, Scene II: The Grove
25 movements
(every track is a movement)
There might be different answers and opinions, depending on what would be 'musicology correct', or what would be most useful in relation to a digital music manager such as MusicBee.
Perhaps an additional 'part' or 'piece' tag could solve a lot, but that is probably not a realistic option for most of us, so I am curious what would be a smart and useful way to approach this?