I'm currently working on an album with two singers. I'm the composer, they write and perform.

You can get custom made form from a copmpetent attorney.

Do I have a claim to sue?

May be not, it is 1% water susceptible.

Could I legally place a design on a pair of brand name clothing and sell them online using my design name?

No. Not without proper permission.

Do I need to seek legal council after finding my Full Name & Nick Name in a book, along with pictures?

Yes, you need a litigation attorney to consider as many causes of action as possible such as libel to defamation to misappropriation..

There is plenty of erotic art in the public domain for you to use, e.g., Kamasutra, Khajuraho, tantric sex to ancient European art.

In addition to advice from colleagues, you need to make sure that you are not infringing any helmet patents by getting a clearance search from a...

What are the limits to a web designer's copyrights in web page? Can he claim copyright in descriptive text (e.g.,"About" page)?

Look into" work for hire."

Is it OK to re-publish a deceased author's self-published, copyrighted book with just his verbal OK from 20 years ago?

An offer is only valid when accepted within a reasonable time - " did not express intent to him, but now I am interested. " Consult with an attorney.

It depends on your purpose and use. No disrespect should be shown to the flag. Check with the flag code of the states. Consult with an attorney.

It depends. Oral contracts are as valid as written contracts. You need to consult with an attorney in your state.