Royalties are often sold at a "multiple" of their average annual earnings (e.g., a catalog earning $1,000/year sold for $10,000 has a 10x multiple).
Look for "Evergreen" tracks—songs older than 5-10 years that show steady, predictable earnings rather than a sudden spike from a viral trend. how to buy music royalties
A song may lose cultural relevance, leading to a permanent drop in streams. Royalties are often sold at a "multiple" of