Is this cassette rare given its 1980 release?

Yes, as a 1980 release on the Klar! 80 label, it is a vintage item in the Electronic genre.

What format is this music in?

The Roter Stern Belgrad album is available in cassette format.

This specific release is categorized under the Electronic genre.

Name: Roter Stern Belgrad – Session / Alpha-Waves (Cassette)
Brand: Roter Stern Belgrad

Electronic

What Session / Alpha-Waves by Roter Stern Belgrad is worth on the used market.

Label · Klar! 80Format · CassetteGenre · Electronic

Used

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New / Sealed

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Session / Alpha-Waves by Roter Stern Belgrad (1980) on Cassette. The Discogs marketplace floor is null with 0 copies currently for sale.

Pressing, country, and condition (media + sleeve) move vinyl/CD values the most — first pressings and clean copies command a premium.

Is this cassette rare given its 1980 release?: Yes, as a 1980 release on the Klar! 80 label, it is a vintage item in the Electronic genre.
What format is this music in?: The Roter Stern Belgrad album is available in cassette format.
What genre does this Roter Stern Belgrad release belong to?: This specific release is categorized under the Electronic genre.