LOS ANGELES (Reuters) - Green Day frontman Billie Joe Armstrong said alcohol and prescription drug abuse forced him into rehab last year after sessions when he would black out and have no memory of what he had done. "I couldn't predict where I was going to end up at the end of the night," Armstrong, 41, the lead vocalist and songwriter for the California punk rock band told Rolling Stone magazine in an interview. "I'd wake up in a strange house on a couch. I wouldn't remember how. It was a complete blackout," he said, opening up about years of addiction to drink and prescription drugs. ...