I've written about the difference between copyrights and trademarks before. Yesterday's post focused on literary works, which could certainly have commonalities (e.g. lyrics) with today's subject. From the written word to the spoken - today we're talking about...
So any format which is "fixed" (i.e. CDs, MP3s, record albums, etc.) AND emits sound should be filed for copyright. The Copyright Office allows online filing and seeing as how it's only 35 bucks a pop it is more than worth it to file each and every sound recording you create.
You'll want to research and trademark any element that you're using that represents you as a band or a musician. This means your personal name (e.g. Beyonce), your band name (e.g. Maroon 5), or your logo (e.g. Wu-Tang).
This area is going to be a bit different for you. Usually labels will own the copyright on the sound recordings (or attain them through a recording agreement); however, scenarios differ so cementing your plan before signing an artist is probably the way to go. Check out this link for further information.
This area is pretty clear cut for you folks. Since you're offering a service you'll want to make sure that your company name and/or logo is legally available before filing for a trademark.
Have questions? Please leave a comment here or email me directly -- shannon at tmexpress.com