Hey @Bee__-, help's here.
We want all the world’s music on Spotify, but availability can vary over time and between countries for many types of reasons depending on the permissions from rights holders.
The good news is: We add new music and podcasts to Spotify every day, so if you can’t find something you’re looking for right now, it may appear (or reappear) soon! This also applies for artists.
Hope that explains things! :)