[datpiff]

> Are essentially all albums perfectly in tune with A 440 hZ? For example with classical music, I understand that 442 is also used, baroque is sometimes at 415, and 432 has been common as well? I don't know about pop but I can't help but wonder if some artists have intentionally chosen something other than 440 over the decades.

No they are not all tuned to 440Hz. This is really evident if you play an instrument and want to play along with an album.

[iaresee]

Every. Rolling. Stones. Album.