Turning away from the classical genre (though I am by no means opposed to many composers mentioned in this thread), I consider the K-pop genre to contain some of the best examples of a 'pro-metabolic' or vitalistic contemporary music.
Consider Red Velvet's 'Ice Cream Cake', or 'Red Flavor'
https://www.youtube.com/watch?v=glXgSSOKlls
https://www.youtube.com/watch?v=WyiIGEHQP8o
Very few examples exhibit such open expressions of the energetic, youthful, carefree, sugary/bubblegum essence of true pop that you'll find in these songs.
While much of contemporary western music has long since gravitated towards more introspective or subdued themes, perhaps through deliberate PsyOps, in attempts of deracinating and demoralizing western youth through displays of ugliness and despair, K-pop continues to celebrate a certain innocence, joyfulness and even vitalistic tendencies.