There is no new music.
There are no new harmonies, tonalities, or rhythmic devices.
That aside, in terms of 'popular music', there was music released in 1969 that would not be mistaken for music released in 1959; there was music released in 1979 that would not be mistaken for music released in 1969; and there was music released in 1989 that would not be mistaken for music released in 1979.
IMO we can not say the same for 2010/2000 and 2020/2010. Has there been anything new in popular music in over 20 years?