Well, since the theme pretty much equates to "songs other people have recorded other than this version", I would guess that someone somewhere once did a cover of "Sunshine of Your Life", errr, ...Love."
One of my fave cover versions, in fact:
https://www.youtube.com/watch?v=tC5hXBt5RIsBUT (looking at the list), Aretha's "Respect" IS the cover (of Otis' original), and I'm totally blanking on who covered "Groovin"
News: Vietnam War protests
1. The Beatles, Sgt. Pepper’s Lonely Hearts Club Band
-Sports: Introducing Evel Knievel
2. The Monkees, I’m a Believer
-News: Loving v. Virginia
3. Tommy James and the Shondells, I Think We’re Alone Now
-News: Elvis Presley marries
4. Neil Diamond’s, Girl You’ll Be a Woman Soon
-Movie: The Graduate
5. Jackie Wilson, (Your Love Keeps Lifting Me) Higher And Higher
-News: Muhammad Ali stripped of his heavyweight title
6. Aretha Franklin, Respect
-Movie: You Only Live Twice
7. The Young Rascals, Groovin’
-Sports: Super Bowl I
8. The Doors, People Are Strange
-Movie: In the Heat of the Night
9. Frank and Nancy Sinatra, Somethin’ Stupid
10. The Box Tops, The Letter
BONUS: Cream, Sunshine of Your Love