[ben7799]

Another example is orchestras that record historical pieces with period correct instruments that are intonated/tuned/tempered in a period correct way as those changed over the years.

Look up Well Temperament versus Equal Temperament, etc..

These kinds of changes can make things sound quite different than a modern interpretation on modern instruments setup in a modern way.

[WillAdams]

The appropriately-named "The Academy of Ancient Music" is a very approachable way to access such music recordings.