The earliest was a song recorded in 1970, the first to have all four members together.

The earliest recordings of him can be heard when he was 16.

Earliest recordings of health were found in China. They were carved into bone and contained basic health information.

Unfortunately, no; prior to 1978, sound recordings were protected by state law rather than federal law. The earliest any sound recordings will enter the public domain is February 15, 2067.

No; the song itself will be protected through 2034, and recordings through 2067 at the earliest.