Instead of me just giving you random milestones for income from Spotify streams, why don't you just check out my Spotify Stream calculator above.
This will enable you to see a couple of cool things.
In the top row, you can just input how much income you want to make per month from Spotify streams.
Then, in the second row, you can input how many songs you have on Spotify.
Finally, you can adjust the "revenue per stream" slider so that it more closely matches your reality right now.
Like I said, the average is about $0.004 per stream, so I would just leave it there.
Once you've inputed all of that data, out spits: