Pop music today (as a genre, not just music on the charts) is very programming-heavy, and not generally oriented around people playing on and performing with live instruments. This leaves little room for pop “bands”, and when pop is made by groups, it is typically groups of singers, with one or two of them able to play a bit of guitar or piano for a more intimate ballad. Most of the bands you mentioned would be considered “rock” if they were new artists today (or jazz for Glen Miller).

There are solo artists like Taylor Swift where a significant portion of the material is played by a band, but these bands are made of professional sidemen/session players, and the “artist” is still just one person.