oobie,
copyrights:
www.copyright.gov
trademarks:
www.uspto.gov
Make sure that you know that legal stipulations of any gov't registration before you send any money to any of the offices. Also keep in mind that a copyright is
one of your rights under US law.
You don't have to pay anything to have a legal copyright. If you write a song, the second that the song is finished you have a legal copyright to it. If you anticipate legal trouble, the copyright can be
optionally registered at the copyright office for $30, but again, registration is NOT necessary.
I wouldn't even consider registering a trademark unless I was selling large amounts of merchandise (not CDs)... enough that piracy would be a problem. Recorded material is not covered by a trademark, but by your (free) copyright.
A trademark is actually free, just like a copyright, but only for "products in use" and if it currently doesn't infringe on a mark that is already registered. The trademark protects your primary logo/band name on products or in advertisements, but nothing else. Your copyright protects the original songs.
If you wanted to prevent another band from playing live under the same name, you would need a servicemark. It's like a trademark, but for services instead of goods.
Remember that neither copyrights, trademarks, nor servicemarks are going to automatically protect you. You still have to be the one who finds offenders and legally takes action, usually in small claims court, or possibly in criminal court in cases of large-scale piracy.
Costs?
The trademark registration filing fee is $335.00
per class of goods and/or services. If you want to protect your logo on your CD, that's one class (class 9). Logo on clothing? Another class (class 25). Stickers? Yet another. (class 16). See my point?
... and then the wheel fell off.