I'm old enough to remember 1965, when the Top Ten changed completely every week, because Motown and the Brill Building were full of composers pouring out great material at an unprecedented rate. What gets glossed over in any of the documentaries on that period, is the fact that all of the 'bands' at the time were artificial assemblies of singers, backed by studio session musicians.

What makes the Supremes infinitely better than the Spice Girls, is the simple fact that those women could all sing well, the musicians were the best that could be found, and the composers were top-notch talents. As the computer jocks say, Garbage in, Garbage out!