https://www.youtube.com/watch?v=cnvngwDic7A

i think the backing music in this make up advert is good because the beat goes slow and then just drops in. So then it will get peoples attention to look at the advert because its a good drop into the advert and also it is a good beat.
The Tempo is slow and then goes quite fast. The key has different type of range used in the advert. The background music in the advert is major key because the beat it load and bouncy. It is also a non dietetic sound.

https://www.youtube.com/watch?v=x_CFQ2i28FI

I think this advert is good because the backing movie is fun and its an happy sound and don't over sound the voices that are talking. Also they is talking in the advert telling you different facts about the company that are selling the sofas. For example the advert is saying, how the staff will help anybody find the perfect fabric for your sofa etc.
The tempo is not very fast its just at a normal past. The key of the song is just the same range it don't change. That background song for the advert is a major key becuase its a happy sound and quite bouncy. It is also a non dietetic sound.

https://www.youtube.com/watch?v=vqTdLEl1S_s

I don't think this car advert is good. Because the background music don't have anything to do with the car its trying to advertise, also it don't really show the car it just shows two people and shows the car like once at the end. The tempo was calm but not slow also the range of the song didn't really change it stayed the same. The background music was a major key because it was quite a happy song.