On the Floor at the Boutique
If you had to explain dance music to someone from another planet, you could  simply playOn the Floor at the Boutiquefor the curious creature.  Besides being a great party album, this Lo Fidelity Allstars DJ remix disc is  like a crash course in late-20th-century grooves.  Hip-hop, techno, R&B;,  house, big beat, go-go, and more are all part of this expansive set.  Even  a couple of late-'60s soul tracks wind up on the CD. When the band's  eerie, atmospheric intro, "You're Never Alone with a Clone," segues into the  infectious '90s R&B; ofBlackstreet's "No Diggity," you know the album is  going to hop genres with abandon.  Rather than crafting a finely contoured,  ever-building DJ set, the British big-beat group goes for broke: the CD is an  unrelenting rush from one energy peak to another.  Amazingly, the Allstars  actually manage to pull off this take-no-prisoners approach without dulling  the senses.Boutiqueis a 73-minute olio of fever-pitched dance mania.--Fred Cisterna