On this week's "60 Minutes Presents," an hour of music. Tony Bennett has Alzheimer's Disease, but when it comes time for him to sing, the 95-year-old crooner emerges from the fog of dementia. Anderson Cooper talks with Lady Gaga and others about Bennett's onstage transformation. Half-century old footage of the Beatles at work tells different story of the band's darkest days. Jon Wertheim speaks to Peter Jackson, the director of the documentary "Get Back." Finally, Sharyn Alfonsi introduces us to the self-dubbed "Best Band in the Land," New Orleans' St. Augustine High School Marching Band.

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