Going by the title, this is a collection of past tracks by Hellcreator.
In case you don't know Hellcreator, he was one of the earliest producers in the Early Hardcore revival. New producers, that is - as opposed to those who do it since the 90s.But it was never just "early", but also close to terror / speedcore.
And one thing that always stood was his prominent use of rave-y / trance melodies, almost like krautrock or shoegaze even.
So there is the opposition of calm, soothing, "cheerful" melodies - and all the terror beats.
And I really like that!
https://hellcreator.bandcamp.com/album/from-the-past