The specific amount of royalties that could be collected on your behalf are subject to a number of factors, for example total streams on Spotify, YouTube views, Radio broadcasts, whether your music has been played Live, if it features in any TV Show/Ad, TikTok videos, iTunes downloads and many more.

It also depends on how much % you own of each song. For example, if you both wrote the lyrics and produced a song, then you might own 100%. If you collaborated with a producer to compose the instrumental, then you may have 50%, and so on.

To have a rough estimate, if we only take Spotify in consideration, you can assume a range between 0.0003$ and 0.0005$ per stream, which would be between 300$-500$ for every 1M streams.