As visual art, yes. There would need to be demonstrable creativity and originality, of course.
Copyright protects creative works, and royalties are paid to the copyright holder for use of the works.
A minor owns the copyright on any works they create.
Copyright law.
According to copyright laws in most countries, "musical works" are specifically listed among protected works. The intent of copyright is to encourage creativity, and music is certainly creative.
Your original works, on your Wordpress blog, are automatically protected by copyright. Using others' copyright-protected works on your Wordpress blog requires an exemption in the law or permission from the copyright holder.
Orphan works are works in which there IS a valid copyright but they holder of the copyright has not come forward or is not know. They are NOT available for reproduction.
Millions of text documents and other works are copyright 2009.
Works are protected by copyright as soon as they are "fixed." If you wish to register a work with the copyright office, you may do so.
Redistributing copyright works means making a work further available by copying and distribution, including uploading. It is one of the exclusive rights of the copyright holder.
Works no longer protected by copyright are said to be in the public domain.
Copyright law applies virtually equally to both "hard copy" and digital works.
Works in the public domain have no copyright restrictions. Note also that works outside of the protection of copyright law have no copyright restrictions. For example, works of the US government are not copyrighted under US laws, nor are works that are not creative or original or which have not been "fixed in any tangible form", or which are merely ideas, principles, systems, functions, processes, concepts or discoveries.