Music stopped being made in 1978. Then disco destroyed it all. Plus...the Beatles sucked.
It was this kind of music that put disco back where it belonged.
In obscurity.
You are, I think, being too generous. The cut-off date for me is somewhere around 1970, before the British Invasion completely ruined everything. But as usual, your mileage may vary.
And now a word from Johnny Cash (1963):
“Music stopped being made in 1978. Then disco destroyed it all.”
I’m a little more generous than you. I quit listening to new music in 1982.