In the United States, a composer is a person who creates music, either by musical notation or oral tradition, for interpretation and performance, or both. Composition is the act or practice of creating a musical work. A person who writes music is called a composer. Composers of primarily popular or folk music are usually called songwriters; with songs, the person who writes the lyrics is the lyricist.
There is not much information available on the topic of "composers services." However, it seems that these services would provide assistance to composers in creating and/or marketing their music. It is possible that these services could be used by both amateur and professional composers.
After interviewing several composers, it is clear that there is a range of services that these professionals can provide. From scoring music for films to creating new pieces for bands, these artists have a lot to offer the world of music. However, it is also clear that there is a lot of competition in this field, and only the most talented and experienced composers will be able to find steady work.