DistroKid.com

DistroKid.com allows unlimited uploading of your songs/compositions, and they will put them on iTunes, Amazon, Google Play and Spotify -- for an annual fee of $19.99. And you get 100% of your royalties. Of course they are paid through DistroKid.

I'm checking it out and will put my thoughts here as soon as I see how it all works.

DistroKid allows you to upload one free song to try it out.

If you get five referrals, you'll get a free unlimited upgrade. I'm trying that out with the links to their site to see if that works, too.

You don't have to pay or give credit card information when you register. Just your email address and desired password.

You can read about it via a couple of links on the DistroKid.com site.

The lack of particulars on the site makes me a bit suspicious, but we'll keep an open mind to see what gives.
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Here's what I'm seeing as I look through the site:

1. After registering, it goes to the "Upgrade for free" page that gives your referral URL and explains the 5 people register credits you with unlimited uploads. It doesn't say if that's forever or just for the first year.
2. Links at the top of this page are + Upload, Upgrade, Albums, Bank and a symbol that signs you out of the site (learned that by clicking too quickly).
3. I use long passwords. Don't know if that was a problem, but the site didn't recognize my password -- and I pasted it into the password fields when I registered. So I clicked "Forgot My Password" and it emailed me a link to reset the password. I copied and pasted the same password. We'll see if I get into the site again after signing out. But first, to continue while I am logged in now.
4. There's also a link on the "Upgrade for free" page that says "Click here to upload music."
5. It's linked to the same page as the + Upload link at the top of the page.
6. Clicking on either of those links take you to the "Upload an album" page.
7.  On that page, "Stores" has already checked boxes for iTunes, Spotify, Google Play and Amazon.
8. Album types are One song (a single) and Multiple songs (an album).
9. Artist/band name.
10. Album cover "Choose File" button. Specs are jpg extension, perfect square, at least 1000x1000, optimal is 2500x2500.
11. Language dropdown.
12. Primary genre. Secondary genre
13. For the one free upload, there's a Track 1 section with Song title, Explicit lyrics No/Yes, and a "Choose File" button. File specs are WAV/FLAC/MP3/CDDA -- optimal is WAV.
14. And finally, a "Just making sure..." section with check boxes for "There are no typos or errors in my band name, song titles, or other text," "I've selected the correct files for my song(s) and artwork," and "My music is original, I own the copyright and have the legal right to sell it in stores worldwide.
15. The "Upgrade" link takes you to the same page where you clicked on "Free" to try the site out.
16. The "Albums" link takes free registrants back to the "Upgrade for free" page.
17. The "Bank" link takes you to "Your earnings" with lines for the four services selling your songs.

There are a lot of unanswered questions from what I've been able to see on the site thus far. I'll upload a song and see if that gets me more answers.