The Last.fm API key is essential when it comes to recovering additional information for the Artists module.
First, head over to: https://www.last.fm/join
Fill the form to create an account. (Click on Login if you already have an account).
Once the account is created and activated (you receive an email to activate the account after creation) go to this address:https://www.last.fm/api and click on the link Get an API account.
You will then be directed to page where you will need to fill in a Create an API account form with the relevant information about your radio website.
In the field Application Name, enter the name of your website, provide a short description and enter the address of your website.
You do not need to enter a callback URL.
Now that you have obtained your API key simply copy it and head over to the admin panel of your radio website: Parameters > Configuration > External API
Paste your key into the LastFM API Key field.
Don't forget to click on Save. And there you go! Your Artist module will now recover all the necessary information!