Hi this is a world were WW1 nevered happened, the Bell Epoque in Europe never ended, Guild Age in America is still going on, and in Mexico Porifiato is still going on.
The original One % still rule, the great Royal House of the 1900's.
But this world does have have a Dark Flip side, this is a White Man's world Women don't have rights or Vote, Racism is the norm, and Africa is cut up like a Cake under European rule so is most of the world. The Class system is the norm through Europe.
The problem is what type of culture would there be and Music as well,
LW
Seems unlikely given that Finland granted women the vote pre war as did New Zealand and it was already a live issue in the UK, which had already moved towards the franchise for local government elections several US states were also moving in that direction.
As for rights the World War was considerably after for example the married women's property act, The lack of a war would have slowed the OTL trends down, but reversed them entirely why?
As for racism hmm maybe, but again it seems unlikely that a multi national empire in the modern era would not see some improvement if it was going to survive.
For example the lack of a world war would not have solved the Irish Question, which was very much a live issue in 1914. It seems pretty unlikely that a continuing Liberal Government,undivided because Lloyd George did not evict Asquith, would commit to solving Ireland's problems with blood thirsty repression.
Certainly no war would probably mean no Easter Rising, but it would also mean a settlement had to be found
Similarly Britain had already begun the progress towards self-government in India before WW1. without the war this would have been slowed, but I see no particular reason why India would not have eventually reached Dominion status. In theory an Irish settlement and an un-partitioned India has potential for rather less racism than now.
Similarly why would Austria Hungary and the Ottaman empire continuing to exist create more racism, rather than what happened OTL? Without WW1 there may have been no Armenian Genocide, no stupid Wilsonian 14 points, no coming to power of the house of Saud and certainly no Hitler, probably no Stalin or Mao.
Only in the USA is racism likely to have been worse than OTL, or to have endured longer, oh and possibly South Africa.
As for class hmm maybe but some Empires are less class ridden than others. In many ways the British Empire and to an extent the French had been very much the triumph of the middle classes not the aristocracy. Only really the Russian Empire was ever completely dominated by an Aristocracy.
It is hard to see how successful Empires could be totally class-ridden in an age of industrial and commercial power, rather than one based on land.
So to get to where the OP says this world is it needs something else that throws social progress backwards. The absence of war would only have slowed it.