Dear Mr. Berry, The copyright law effects what you create from the moment of creation.
Registration enables enforment of the rights.
There is compulsory licencing of music with royalities to the composer or composers. Band names are service marks. They have to be registered to maximize protection. They should be cleared by searching to see if the are not in conflict at the outset. Trademarks and service marks and copyrights are covered by national statues so that they can be dealt with nationally rether than as local law issues.