Pure SID chip aggression. Mikkel Hastrup and Saul Cross wrote these 25 tracks for two C64 platformers released through Psytronik and RGCD, and the 6581/8580 chips are absolutely screaming throughout. Soulless I's In-Game theme locks into this relentless pulse that makes every pixel-perfect jump feel life or death, while Soulless II shifts gears hard with The Forest and The Temple, layering arpeggios in ways that squeeze textures out of the hardware you wouldn't think possible.
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The loader tunes deserve their own mention. Genuinely entertaining pieces designed to make tape loading bearable, and they go harder than most actual game tracks. If you think modern chiptune artists have maxed out the C64, this will correct that assumption fast.