Hey, ​@lcg 

First, we need to understand how that’s work.
Once the user clicks the link, they pre-save the music or there are additional steps?

If there aren’t additional steps, you can add a tag to the user once they click the button. Then add a smart delay (one hour, for example) and check if the tag was applied to the user, using the condition block. Something like this:

But, if you send the user to a landing page, you can use Manychat pixel. You can find more information about this here: https://help.manychat.com/hc/en-us/articles/14281244168476-Manychat-Pixel