Lucinda Williams isn't easily intimidated, but it would be hard for any musician not to shudder at the task before her.The mission? Record an album of Beatles songs — only one of the best-known catalogs in popular music — in the same London studio where most of the originals were made. She and her band had just three days.The result, “Lucinda Williams sings the Beatles from Abbey Road,” becomes public on Friday. It's the seventh in her series of “Lu's Jukebox” projects and the first one that will be made available on streaming services.The Nashville-based singer-songwriter delivers her take on 12 Beatles songs, most of them from the band's later period. She takes on hits like the Paul McCartney ballads “Let it Be” and “The Long and Winding Road,