Griff will have the links when he uploads the video to the web page, but if you want to get started a bit earlier, here are the links he mentioned in the video.
This is the link to the site he used through most of the video on melodic dictation.
https://www.teoria.com/en/exercises/md.php
This is the link to the site he used through most of the video on melodic dictation.
https://www.teoria.com/en/exercises/md.php