Hi Kai, 1. I like the song of this video. NO 2. I like this video's song. YES but not great 3. I like the song on this video. YES but not great 4. I like the song in this video. YES - best answer 1. What is this video'song? (video’s song) YES but not great 2. What is the song in this video. YES - best answer 3. What is the song on this video. YES but not great 4. What is the song of this video. NO Also the last 3 options that you listed ( 2. 3. & 4. ) are questions so all of these need a ‘?’ I hope that this helps :)