yes
yes, epic band, I don't always like their music, but they're definately epic
Yes, Rush is THE epic band. 2112, seeing as how it was written largely based on one of my favorite authors, Ayn Rand, gets my #1 vote.
Also, I think a lot of what Tool does is epic. Their albums could be listened to from beginning to end as one whole story, even though, like most bands, certain songs become popular and aren't ever listened to or discussed in context. Other similar bands: Zao, Norma Jean, and one of my favorite bands EVER: Queens of the Stone Age (Songs for the Deaf is freaking fantastic)
Fourth Estate: Kara Kum: Mirage, Ten Days Lost in the Sun, & Shadow of the Dune. Similar artist(instrumental rock/jazz): Joe Satriani
There are thousands of classical composers who wrote epics, but I assume we're discluding that genre of music.