Beret could refer to three artists:
One is a Spanish singer (Javier Beret). Beret is the new sensation of the urban Spanish music. With only 20 years old he has already published three albums and reached 64 million views in his Youtube channel. He offers something different mixing reggae, rap and dancehall.
One is a "French Hardcore" band from the United States.
The other is a Japanese Jazz Band. Read more on Last.fm