Is this EP rare since it's self-released?

Yes, as a self-released item from 2007, this EP by Post-foetus is likely quite rare in its format.

What is the release year and genre of this music?

The EP was released in 2007 and falls under the Electronic genre.

This music is available in File and MP3 format.

Name: [Post-foetus] – The 1st Will Wiesenfeld EP (File, MP3)
Brand: [Post-foetus]

Electronic

What The 1st Will Wiesenfeld EP by [Post-foetus] is worth on the used market.

Label · Not On Label ([Post-foetus] Self-released)Format · File, MP3Genre · Electronic

Used

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New / Sealed

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Price data verified against · 1

The 1st Will Wiesenfeld EP by [Post-foetus] (2007) on File, MP3. 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 EP rare since it's self-released?: Yes, as a self-released item from 2007, this EP by Post-foetus is likely quite rare in its format.
What is the release year and genre of this music?: The EP was released in 2007 and falls under the Electronic genre.
What format is this music available in?: This music is available in File and MP3 format.