Something that I found to be quite impressive here was the beautifully laid out textures lingering in the background. The textures seemingly provide the track with character and slightly aid with the swing of the drums.
The inclusion of the guitar injects an air of soulfulness into the lo-fi driven instrumental, and that soul echoes out even more by virtue of the delay on it.
Overall, Osvaldo & siab's "Slowly" is extremely laid back and is the kind of lo-fi hip hop track which goes beyond the studying purpose as it's brimming with musicality.