The verse vocal melody to Leo Sayer's signature 70s soft rock ballad, When I Need Love (released February 1977) bears a strong resemblance to the chorus vocal melody to Leonard Cohen's folk song Famous Blue Raincoat (released 1971). The intro/outro vocal melody to Elton John and Gary Osborne's pop hit Little Jeannie (released May 1,1980) also seems to take inspiration from Famous Blue Raincoat (i.e "You stepped into my life from a bad dream [...]"). Thanks to Ian R. (@77BlueJays) for suggesting this comparison!
When I Need Someone (:14) VS Famous Blue Raincoat (1:01)
The chorus chord progression/vocal melody to Forever In Your Mind's song Hurricane (released April 29, 2016) is reminiscent of the outro chord progression/vocal melody ("nah nah nah") to the Beatles' classic Hey Jude (released August 26, 1968 -- nearly 50 years ago). [Thanks to Justin Schack for this one!]
The chorus to Adele's single Send My Love (To Your New Lover) is oddly reminiscent of the chorus to Lorde's Royals, while Send My Love's verse chord progression/guitar riff echoes Cold War Kids' Hang Me Up To Dry.
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.
The chorus vocal melodies to Taylor Swift's Out of the Woods (released February 5, 2016, and co-written by Jack Antonoff) and Eve 6's alt-rock chart-topper Inside Out (released May 26, 1998) are very similar. While in different keys (OotW: C; Inside Out: B), both melodies share the same the same rhythmic pattern or scansion, emphasizing syncopated sixteenth notes. Compare the chorus lines, OotW's: "Are we out of the woods?", with Inside Out's "I would swallow my doubt." Similar scansion can be found in The Killers' Mr. Brightside (released September 29, 2003), Jack Johnson's Mudfootball (released February 1, 2001), and Kid Rock's Bawitdaba (released April 8, 1999)