Lets take this in stages
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Pop/Rock Recording Artist Credit/Track Artist Credit
Apart from the misused standalone recordings recordings exist as part of at least one release and the recording credit is actually the track artist credit of the release that the recording was originally added to.
So if the recording is part of only one release there is no difference between recording artist credit and track artist credit.
Track artist credit is only different when the exact same recording is on a different release but credited slightly different.
Often there is no difference between the release artist credit for the release and the track artist credit/recording artist credit for all tracks on the release. -
Classical
I dont see why we cant adhere to the same logic.
So when a a new release is added with new recordings there would be no difference between the recording artist credit and track artist credit for those recordings.
There seems to be this idea that tracks are not credited on Classical music releases but when I look at my collection I’m not seeing this, they don’t neccessarily credit each track seperately if ther eis no difference but differnces a re recorded.
Example 1
A release with one concerto on each side, both concerto are by the same composer, both performed by the same orchestra and with the same conductor, no soloists, each consisting of three movements.
Then the release artist credit/track artist credit/recording artist credit would likley be the same.
Example 2
A release with one concerto on each side,each concerto by a different composer, both performed by the same orchestra and with the same conductor, no soloists, each consisting of three movements.
Then the release artist credit would have both composers, orchestra and conductor.
Tracks on side 1 would have one composer,. orchestra, conductor as track artist credit/recording artist credit
Tracks on side 2 would have one composer,. orchestra, conductor as track artist credit/recording artist credit
Example 3
A release with one concerto on each side,each concerto by a different composer, both performed by the same orchestra and with the same conductor, each consisting of three movements, Soloist is credited on track 1 of both
concertos.
Then the release artist credit would have both composers, orchestra and conductor, possible soloist depends on what is written on cover.
Tracks 1 on side 1 would have soloist, one composer, orchestra, conductor as track artist credit/recording artist credit
Tracks 2,3 on side 1 would have one composer, orchestra, conductor as track artist credit/recording artist credit
Tracks 1 on side 2 would have soloist,one composer, orchestra, conductor as track artist credit/recording artist credit
Tracks 2,3 on side 2 would have one composer, orchestra, conductor
Example 4
Another release containing recordings 1,2,3 the same as example 4, but this time the soloist is credited by name using a different script language so the track artist credit for track 1 would differ from the recording artist credit for the recording
Then ideally relationships should be added for composer, orchestra, solists as required. But its worth noting that relationship only let you link an entity to an entity you cannot capture any difference in the way the name is written on the sleeve, that is why it is important to try and capture that in the recording artist credit.
With the solution I propose you capture the relevant track specific detail as written on the sleeve. And in the majority of cases track artist credit and recording artist credit would be the same so editing is easier because you just add them once, and it wouldn’t be so critical for applications to have to guess what guidelines were being used to interpret the data as the relationship between recording artist credit and track artist credit would be the same for all releases.
Applications that needed to better support Classical could also construct a ‘Track artist’ based on relationships (although they are not always added)
The difference between Classical and Pop/Rock would simply be that for Pop/Rock the performer is normally credited, and is often also the composer. Where as with Classical the composer/conductor/orchestra/soloist are all of interest.
Regarding your Picard mappings I assume picard writes the same value for all formats and I expect this would be the track artist credit.