Here's an amazing 2014 (the 40th. anniversary of Austin City Limits) performance of Buddy Holly's "Not Fade Away" by a group of all-stars that includes, Joe Ely, Jeff Bridges, David Grissom, Bonnie Raitt, Sheryl Crow, Lloyd Maines, Gary Clark Jr., Jimmie Vaughn and Doyle Bramhall II
The Beatles - A Hard Day's Night (isolated vocals)
Apparently it's much harder to isolate the vocals from these early Beatles songs because of the way they were recorded back then (4 track?). This guy has done a pretty good job and it's amazing hearing John's voice sound so raw.