I scame across a few - as I assume - flaws in the MPD configuration which makes the library features less usable than I would hope them to be.
1. Apparently, the MPD sorting ranks track numbers higher than the album tags in the files. It also appears that if the track numbers are the same, the alphabetical order of the track names is being preferred.
As an example, the folder structure of the files is as follows:
\---Pop
|
+---Paul Simon
| \---(1991) Concert in the Park
| |
| +---CD 01
| | Paul Simon 01. Obvious Child.mp3
| | Paul Simon 02. Boy in the Bubble.mp3
| | Paul Simon 03. She Moves On.mp3
| | Paul Simon 04. Kodachrome.mp3
| | Paul Simon 05. Born at the Right Time.mp3
| | Paul Simon 06. Train in the Distance.mp3
| | Paul Simon 07. Me and Julio Down by the Schoolyard.mp3
| | Paul Simon 08. I Know What I Know.mp3
| | Paul Simon 09. Cool, Cool River.mp3
| | Paul Simon 10. Bridge over Troubled Water.mp3
| | Paul Simon 11. Proof.mp3
| |
| \---CD 02
| Paul Simon 01. Coast.mp3
| Paul Simon 02. Graceland.mp3
| Paul Simon 03. You Can Call Me Al.mp3
| Paul Simon 04. Still Crazy After All These Years.mp3
| Paul Simon 05. Loves Me Like a Rock.mp3
| Paul Simon 06. Diamonds on the Soles of Her Shoes.mp3
| Paul Simon 07. Hearts and Bones.mp3
| Paul Simon 08. Late in the Evening.mp3
| Paul Simon 09. America.mp3
| Paul Simon 10. Boxer.mp3
| Paul Simon 11. Cecilia.mp3
| Paul Simon 12. Sound of Silence.mp3
All files are properly tagged with track numbers 01, 02, 03 etc. and CD numbers 01 and 02.
When I click through the Library via "Artist" -> "Paul Simon" -> "Concert in the Park" I get a track listing as follows:
Coast [NOTE: from CD 02]
Obvious Child [NOTE: from CD 01]
Boy in the Bubble [NOTE: from CD 01]
Graceland [NOTE: from CD 02]
She Moves On [NOTE: from CD 01]
You Can Call Me Al [NOTE: from CD 02]
Kodachrome [NOTE: from CD 01]
[etc.]
The files are not only displayd in this wrong order in the library view but also added in the same way to the play list.
2. Another problem arises with albums with the same title (which often happens in the area of classical music, i.e. if you have several different recordings of the same opus, let's say, Henry Purcell's "Dido and Aneas"). If you click through the Library via "Composer" -> "Henry Purcell" -> "Dido and Aeneas" you end up with all files from different recordings mixed with each other, irrespective of tags and folder structure.
Instead, if you click via "Album" -> "Dido and Aeneas" you end up (correctly) with several listings, dependig on the respective album artists.
3. A third problem, also mainly arising in the area of classical music where one has typically different combinations of artists (but the same can appear in the area of pop and rock), e.g. (separated by semicolons):
Album #1: "Philharmonia Orchestra; Warwick Braithwaite"
Album #2: "Philharmonia Orchestra; Ambrosian Opera Chorus; Giuseppe Sinopoli
Album #3: "Mermaid Singers and Orchestra; Giuseppe Sinopoli"
Album #4: "Philharmonia Orchestra; Warwick Braithwaite"
As Album #1 and Album #4 have absolutely identical entries, the Album Artist structure in the Library looks as follows:
Mermaid Singers and Orchestra; Giuseppe Sinopoli
Philharmonia Orchestra; Ambrosian Opera Chorus; Giuseppe Sinopoli
Philharmonia Orchestra; Warwick Braithwaite
However, it would be preferrable, if all entries separated by semicolons would get their own library listings, e.g.:
Ambrosian Opera Chorus
Giuseppe Sinopoli
Mermaid Singers and Orchestra
Philharmonia Orchestra
Warwick Braithwaite
Any chance you can adjust the MPD configuration accordingly?