"You Can Do It" by No Doubt (from "Tragic Kingdom")
"Cosmic Girl" by Jamiroquai (from "Travelling Without Moving")
"Who Do You Think You Are" by the Spice Girls (from "Spice")
"Canned Heat" by Jamiroquai (from "Synkronized")
"Never Give Up On The Good Times" by the Spice Girls (from "Spiceworld")
"Anticipating" by Britney Spears (from "Britney")
Many of the songs from Jamiroquai's "A Funk Odyssey" album
Check out all the above to see what I mean. Of course, you may not agree with me on some or all of them. As for a band that is disco-sounding full-time, to my knowledge no such band exists, but there could be one out there. Of course, nothing beats the classics.