Reference: slinkiwitch
When did " yeahyeahyeah" happen?
Probably 1963 when the Beatles released "She Loves You".
From Wikipedia:
The British music establishment at that time found the phrase "yeah" controversial. National radio in the form of the BBC broadcast the single and "in some quarters it was seen to hail the collapse of civilised society". Lennon, being mindful of Elvis Presley's "All Shook Up", wanted something equally as stirring: "I don't know where the 'yeah yeah yeah' came from. I remember when Elvis did "All Shook Up" it was the first time in my life that I had heard 'uh huh', 'oh yeah', and 'yeah yeah' all sung in the same song". "The 'wooooo' was taken from The Isley Brothers' 'Twist And Shout'. We stuck it in everything". McCartney recalls them playing the finished song on acoustic guitars to his father at home immediately after the song was completed: "We went into the living room [and said] 'Dad, listen to this. What do you think? And he said 'That's very nice son, but there's enough of these Americanisms around. Couldn't you sing "She loves you, yes, yes, yes!". At which point we collapsed in a heap and said 'No, Dad, you don't quite get it!'".
George Martin, the Beatles' producer, questioned the validity of the major sixth chord that ends the song, an idea suggested by George Harrison "They sort of finished on this curious singing chord which was a major sixth, with George [Harrison] doing the sixth and the others doing the third and fifth in the chord. It was just like a
Glen Miller arrangement". McCartney later reflected: "We took it to George Martin and sang 'She loves you,
yeah, yeah, yeah, yeeeeeaahâĶ' and that tight little sixth cluster we had at the end. George said: 'It's very corny, I would never end on a sixth'. But we said 'It's such a great sound, it doesn't matter'"