Nice choices, Un-Hazed. You mentioned My Morning Jacket before, too, which is also a great choice.
Astrojanitor said Dinosaur Jr. and The Byrds. Another couple of great bands (Also, a +1 on his opinion of Mascis )
I'll throw (in the spirit of my avatar) Warren Zevon in the talk as well. He had a couple of albums that weren't so great, but I'm of the opinion that he was a great songwriter. Let's be honest, who the hell else could have wrote "Roland the Headless Thompson Gunner (yes, it was a collaboration, but still)?"