The site ain't pretty (I have no idea how to manage wikidot), but this is the only site out there with the lyrics and videos to every important Grateful Dead song.
The Grateful Dead
Sometimes disregarded as purveyors of "hippie drug music," the Grateful Dead are actually incredibly versatile musicians. Known as one of the greatest cover bands, the Grateful Dead covers music that can go back as far as a hundred years. They represent a catalog of American music—from jazz to blues to country. You can trust them because it's obvious they have a good taste in music. By listening to a single concert of theirs, listeners will be engrossed in classic Americana.