Is this cassette rare since it was self-released?

Yes, being self-released by The Boy Who Could Fly in 2009, this cassette is likely a rare find in the Folk/World genre.

What format is this music in?

This album is available in the cassette tape format.

The music is categorized under Folk, World, & Country.

Name: The Boy Who Could Fly – Kindergarten (Cassette, Album)
Brand: The Boy Who Could Fly

Folk, World, & Country

What Kindergarten by The Boy Who Could Fly is worth on the used market.

Label · Not On Label (The Boy Who Could Fly Self-released)Format · Cassette, AlbumGenre · Folk, World, & Country

Used

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New / Sealed

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Kindergarten by The Boy Who Could Fly (2009) on Cassette, Album. 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 since it was self-released?: Yes, being self-released by The Boy Who Could Fly in 2009, this cassette is likely a rare find in the Folk/World genre.
What format is this music in?: This album is available in the cassette tape format.
What genres does "The Boy Who Could Fly" belong to?: The music is categorized under Folk, World, & Country.