Except that those predate the era of music records. People are not interested in notes, they are interested in the music. Recordings of Bach and Vivaldi are still usually not in the public domain.
Personally I am interested in the notes, so I'll point out that most of the sheet music for Bach and Vivaldi is in fact under copyright. If you want something out of copyright then you have to get a facsimile of an old edition. Or something that was typeset by an amateur, which will almost certainly be crap because typesetting music takes a lot of skill to do well.
[1] https://imslp.org/wiki/Brandenburg_Concerto_No.5_in_D_major,...
And you can very easily find them. Most moderately well-known compositions have been transcribed into pdf using modern typography (say, with lilypond) and uploaded to imslp and similar sites.