They came with an invoice from Deram Limited in London sent to Roger Linn in Hollywood. Signed by Gloria Calbrath and John Styx. The invoice says the producer was Vic Coppersmith. Artist: Europeans. Invoice line items says it includes "ENC DEMO SAMPLES FOR LINN ELECTRONICS". Dated January, 1982.

The three disks are labeled:

1) "Ultranox drum sounds, Simmons Drums Sounds, Tom Severetts Drum Sounds"

2) "Freddie Perren's Drum Sounds"

3) "Audio Disk: Vic Coppersmith / Europeans"

All three disks are BASF 128 Bytes(!), 25 Sectors.

If you can point me in the direction of those original sample libraries I would be appreciate it, as it gives me a space to start parsing these!