Is this MP3 track rare because it's self-released?

Yes, the track was self-released by Yunyu and was not on a major label.

What is the format and release year of this music?

The music is available in MP3 file format and was released in 2009.

No, this item is listed only as an MP3 file, and there are currently 0 copies for sale.

Name: Yunyu – Walking In A Zombie Wonderland (File, MP3)
Brand: Yunyu

Pop

What Walking In A Zombie Wonderland by Yunyu is worth on the used market.

Label · Not On Label (Yunyu Self-released)Format · File, MP3Genre · Pop

Used

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New / Sealed

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Price data verified against · 1

Walking In A Zombie Wonderland by Yunyu (2009) 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 MP3 track rare because it's self-released?: Yes, the track was self-released by Yunyu and was not on a major label.
What is the format and release year of this music?: The music is available in MP3 file format and was released in 2009.
Are there physical copies available for this Pop track?: No, this item is listed only as an MP3 file, and there are currently 0 copies for sale.