LOS ANGELES (Reuters) – Few musicians are able to keep their careers alive for more than five decades, but pop diva Cher says her latest album is her "best effort ever." Cher, 67, a staple of American dance music, released her 26th studio album, "Closer to the Truth" on Tuesday, her first record in 12 years. "It's my best effort ever, so I'm happy with that. I'm singing better than ever and the songs are really good. I'm unbelievably proud of it," the singer said in an interview with Reuters at her home in California's beachside community of Malibu. …