I guess my favorite bands, in no particular order, would be:
Maximum the Hormone
The Asteroids Galaxy Tour
Dave Brubeck Quartet
They Might Be Giants
Whenever Itzhak Perlman and Yo-Yo Ma play together
On a side note, to the previous poster that mentioned Operation Ivy, while they'll always be a band I remember first listening to via a cheap CD player and the headphones that came with it, I was pleasantly surprised at how good "Energy" sounded on a more "head-fi-esque" setup, despite having the kind of recording quality you'd expect from a punk album of that time. I guess just like Louis Armstrong and Fritz Kreisler, who unfortunately didn't leave behind recordings of a particularly great sound quality either, the music they made transcended any technological limits that they may have met.