That's Leon Russel on piano in that first video!
As a first call studio musician in Los Angeles, Russell played on many of the most popular songs of the 1960s, including some by The Byrds, Gary Lewis and the Playboys, Bobby "Boris" Pickett, and Herb Alpert. He can be seen in 1964's T.A.M.I. Show, playing piano with "The Wrecking Crew" (an informal name for the top L.A. session musicians of the 1960s), sporting short, dark, slicked-back hair, in contrast to his later look. Soon after, he was hired as Snuff Garrett's assistant/creative developer, playing on numerous #1 singles, including "This Diamond Ring" by Gary Lewis and the Playboys
Known mostly as a session musician early in his career, as a solo artist he has crossed genres to include rock and roll, blues, and gospel music, playing with artists as varied as Jan & Dean, Gary Lewis, George Harrison, Gram Parsons, Delaney Bramlett, Ringo Starr, Doris Day, Elton John, Ray Charles, Eric Clapton, The Byrds, The Beach Boys, The Ventures, Willie Nelson, Badfinger, Tijuana Brass, Frank Sinatra, The Band, Bob Dylan, J.J. Cale, B.B. King, Dave Mason, Glen Campbell, Joe Cocker and The Rolling Stones.[
Russell's first commercial success as a songwriter came when Joe Cocker recorded the song "Delta Lady" for his 1969 album, Joe Cocker! The album, co-produced and arranged by Russell, reached #11 on the Billboard 200