If you have a situation where Heardle is blocked, you should know that the reason is due to Soundcloud and the copyright for certain songs in specific locations.
Essentially, Heardle's daily song is selected at random from a Soundcloud playlist. Occasionally, these tracks are unavailable in your region because of copyright restrictions.
You may have encountered a similar issue when attempting to watch YouTube videos that were released for specific regions outside your current location.
Using a VPN service to change your location to a different country is your only option at this time. If you reside in the United States, for instance, you may wish to change your VPN's location to the United Kingdom or somewhere in Europe.
If you do not wish to do so, you will have to wait until tomorrow when the song-based conundrum refreshes to complete it.
In the interim, you can check out our picks for the finest Wordle-like games to satisfy your daily need for brainteasers.