Wikipedia has a "List of best-selling music artists" (http://en.wikipedia.org/wiki/List_of_best-selling_music_artists).

It shows that the BEATLES are at the top of the list, and it does show them for the "Rock / Pop rock" category.

The UK business "Just Music" specializes in selling music for electronica, ambient, acoustic and down tempo genres. They make their music with the best artists and offer high quality albums.

That is not a question.

The Bee Gees have sold more than 220 million records worldwide, making them one of the world's best-selling music artists of all time.

96 million records worldwide making her one of the best-selling music artists of all time.