This is the 1981 song “Find Another Fool” by Quarterflash. Please note the opening lyrics of:“I should have learned this lesson long ago”“That friends and lovers always come and go”That singing is 20 notes long.https://www.youtube.com/watch?v=k0lRM7FmJgUAnd this is the 1979 song “We Live For Love” by Pat Benatar. The same 20 notes (or at least 20 very similar notes) can be heard from the guitar at the beginning. https://www.youtube.com/watch?v=SD8TCo2QW6U