Another great resource is the ODGProd catalog. As I gather, everything they publish is free to download for personal consumption. It's a specific niche of music, so you won't just find anything on there, but if someone likes modern dub, reggae and closely related genres, they can be a goldmine. While the tunes are downloadable, they also publish on major music streaming sites too, and have a live stream on YouTube as well, so it's easy to get into.