The catalog of songs available on Spotify varies greatly by region, but if we strictly follow the licenses, the official number exceeds 50 million. According to the Forgotify portal, many of those millions of songs have never been played on the service, and it invites you to listen to them in a very simple way.
Since Spotify removed its restrictions for free users, its usage increased markedly. Personally, my consumption is still too casual, but I'm sure there are many users getting the most out of these conditions. Today Spotify exceeds 50 million licensed tracks, although the final list of available songs can have some very significant differences from one country to another.
As if that weren't enough, tens of thousands of songs are added to the database daily... and the truth is not all of them are popular. So, unless you get a direct recommendation or come across them in a search, there might not be many chances to discover them, unless you use a service like Forgotify.
What Forgotify proposes is very interesting: There are millions of songs on Spotify that have not been played not even once. And all that separates you from them is the will to press Play. Obviously, this requires a Spotify account, but you are not forced to use the official client, since Forgotify opens the web player in a new tab. What can you find? From songs from India to entire musicals set in the 1980s, including German remixes, old American ballads, Frohsinn by Franz Schubert, and what appears to be a Croatian quartet with an accordion (?).
In two words, a little bit of everything. If you find something interesting, you have the option to share it through Facebook, but remember that despite their lack of popularity, the songs continue to be tied to their licenses, and some of the site's recommendations may not be available in your country. That said, enjoy.