A Star is Born (1976)

Norman Howard (Kris Kristofferson) is a rock star whose career has peaked; he is numbed by booze and cocaine, his music has lost its edge, and his performances have become painfully haphazard. One night, after a concert, he stumbles into a club where he sees a singing group fronted by Esther Hoffman (Barbra Streisand). John likes what he hears and loves what he sees; he tries picking her up, but soon realizes if he wants to see her, he'll have to ask her out on an actual date. He does, and before long the two become involved, although Esther has trouble with John's rock star lifestyle.

One night, a typically burned-out John lets Esther sing a few songs at one of his shows; before long she's the talk of the record business. While Esther's star begins to rise, John's continues to sink, and while she desperately tries get John to clean up and focus on his music, it may be too late to save him.