The Track Artist field should contain just the composer; not the performer(s). Use special artist [unknown] if you cannot find out who the composer is (the name of the composer is often printed directly above the track or group of tracks on classical releases).
- Use the most detailed tracklist available (e.g. inside booklet on a CD release)
- If there is more than one composer involved on the track, try to find out how the work is usually credited.
Usually in MusicBrainz the Track Artist field should contain the Artist as credited for that track. However, classical releases do not have a single track-specific "artist" like pop releases commonly do. A classical track has (usually) one composer, and any number of performers.
Partita V in G major, BWV 829: IV. Sarabande Johann Sebastian Bach
Cello Concerto, op. 85 / Enigma Variations Sir Edward Elgar
Scheherazade, op. 35: The Sea and Sinbad's Ship Nicolai Rimsky-Korsakov (since the release is in the Latin script, we transliterate the name to match it)
Zélindor, roi des Sylphes: Scène 3. Passepied François Rebel, François Francœur