Something to consider regarding older music - baroque and renaissance especially - is that there was no "offical pitch" standard in tuning. Wasn't until 1955 when the International Organization for Standardization officially set the A above middle C as 440 Hz. In Bach's time, for instance, it varied a lot. Organs from the period vary from around A = 410 to 450 Hz and technicians often raised organs in pitch over time as the pipes would be adjusted for wear.
Tim
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