great big sea
If you're american, you probably don't know who Great Big Sea is. They're from Newfoundland, and the first band other than The Beatles and The Spice Girls that I really got into. I guess you could call their music Celtic Folk Pop. Basically, that's what it is. I forget where I first heard them.
One of the reasons this obsession flourished is because my dad liked it, too. I have four of their CDs, and I've seen them three times; Once, at the End of the World Festival in Kenora (a mock folk fest that never really made it off the ground), once on Canada Day at The Forks, and once at the Walker theater.
As far as my obsessions go, this one was relatively short. I think it lasted about half a year.