Bonus tracks in prog albums

[DamoXt7942]

Dear all Moonies,

In progressive-rock albums, especially Japanese ones, there are some bonus tracks.
I believe the bonus tracks are not so good, or out of favor of the artist, or not suitable for the album.
Of course some of them are unexpectedly excellent, but I'm disappointed I couldn't meet such a good track.

So could you let me know about great bonus tracks for you?

Thanks.