Bradley Cooper played, sung and directed the movie. As rock star, he met the girl, Ally in a pub where Ally was singing. He found something in her and they spent a night together talking. He knew Ally was writing a song and in deep down she wanted to be a singer. So he invited her to his live the other day and let her sing her original song in front of his huge audience. Her performance moved them and so did he and Ally. They started to be together and also Ally started her career as a singer. Later Ally became popstar and she even won Grammy. In contrast, his alcohol addiction was getting worse and worse and he came to think like his alcoholic will do bad for her career and life. In the end he killed himself without telling his feeling inside to Ally.
All song in this movie are beautiful. I think this movie is telling everyone even huge star has a darkside. Movie itself wasn't that sad atmosphere, more like love story but what's just happend was really a tragedy.