The music scene in PDX is
exceedingly active and varied. You can find just about anything for any taste. I have friends in several bands. All of which have lots of regular gigs even though their styles, talents, and appeal are completely different.
To get a good vibe of what's going on, it would be a good idea to read the
Willamette Week's online edition found
here. It's a free weekly paper that has a TON of information on local bands, who's playing where, the cover charges, how pricey the joint is and the type of food/beverages are served, the type of cliente, etc. It's a very good source of information for any music junkie new to the area. (Disclaimer: Being an indie paper means they're able to run a little fast and loose with some of their language. So it's more of an "adults only" type of newspaper.)
You also might want to check out the McMenamin's website, too. (
Here.) They have some great places to catch bands whether they're up-and-comers or well established acts like Chris Isaak. (And they have some seriously great beers, too!) The White Eagle Saloon tends to get some really great local indie musicians in there on regular basis.
Good luck! One of my favorite aspects of Portland is the music scene.