Elvis Costello's You Belong to Me (released March 17, 1978) from his album This Year's Model pays homage to (or brazenly loots, depending on your perspective) the Rolling Stones' classic The Last Time (released February 26, 1965). Compare opening guitar riffs/verse chord progressions.
Compare the vocal melody that Chris Martin sings (starting with the line "If we've only got this life") in the outro of Adventure of a Lifetime (released November 6, 2015) with the guitar/vocal melody of Neil Young's Like a Hurricane (released August 8, 1977).
Adventure of a Lifetime (2:38) VS Like a Hurricane (:16)
You'll Be Back from Lin-Manual Miranda's musical Hamilton (released October 16, 2015) is heavily influenced by several Sixties' pop songs including The Beach Boys' God Only Knows (released July 11, 1966), The Beatles' Penny Lane (released February 13, 1967), and the Turtles' Happy Together (released February 14, 1967). You'll Be Back borrows the staccato quarter note keyboard (harpsichord) part from God Only Knows, as well as the Wrecking Crew's muted bass line and bouncy drum groove (present in the Beach Boys' California Girls as well). You'll Be Back's glee club "da da da" vocals in the chorus are also similar to God Only Know's middle section vocals, and Happy Together's "ba ba ba" vocals, while YBB's guitar part (around 3:00) and pizzicato strings are similar to Penny Lane.
As a musician and composer, I’m often struck by similarities between pop songs. If you’ve ever listened to a tune on the radio and thought to yourself, “this sounds really familiar,” or “what does this melody remind me of,” (or more bluntly, “this song is a rip-off of …”) then you have shared in the experience.