Most people are familiar with the concept of singing notes from the minor pentatonic scale over major chords in a 12 bar blues, but why not do it over non blues structures too? Make your vocal lines spicier by adding the b3, b5 or b7 to major key melodies. Be bold dahling! (If you're struggling to pitch the b5 you might want to try it over a IV7 chord).
Because, Come Together (and here), Drive My Car, From Me To You, Get Back, Golden Slumbers, Hey Bulldog, Honey Pie, I'm So Tired, Oh! Darling, Old Brown Shoe, One After 909, She Loves You, The Long And Winding Road,
You can also hear this in some instrumental sections as well notably Piggies, She Loves You and Yesterday
Also Suffragette City (David Bowie)
Ticket 13: Make The Vocals Stay On Non-Chord Tones
Ticket 14: Write An In-Key Melody Over Out-Of-Key Chords
The Band Who Lived Outside
See the full list of songwriting tips here - Tickets To Write