Three "U"-themed tracks for your listening pleasure...
The Exies - "Ugly"
If you like hard rock, The Exies are an exceptional band that most people have never heard of. Along with Sugarcult (featured in the Musical Alphabet - S post), they are a name you can drop while in line for most general admission indie concerts and find immediate acceptance from those in line.
The Pillows - "Wake Up! Dodo"
One of my favorite J-Rock bands. What? You've never heard of J-Rock? You'll understand the definition within a few minutes of listening to this track... The entire album that this track comes from (Wake Up! Wake Up! Wake Up!) is solid and very easy to listen to. (See, I really do listen to everything.)
The Uglysuit - "Chicago"
An indie band out of Oklahoma...