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

Yes, this track is self-released by One Sentence. Supervisor and is listed as "Not On Label."

What is the format of this music?

The music is available in MP3 file format.

Name: One Sentence. Supervisor – Double You Pt. 1 (File, MP3)
Brand: One Sentence. Supervisor

Pop

What Double You Pt. 1 by One Sentence. Supervisor is worth on the used market.

Label · Not On Label (One Sentence. Supervisor Self-released)Format · File, MP3Genre · Pop

Used

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New / Sealed

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Live on eBay now

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Price data verified against · 1

Double You Pt. 1 by One Sentence. Supervisor (2019) 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 track rare since it's self-released?: Yes, this track is self-released by One Sentence. Supervisor and is listed as "Not On Label."
What is the format of this music?: The music is available in MP3 file format.
When was "Double You Pt. 1" originally released?: It was released in 2019.