Copyrights give you exclusive rights as an owner to generate a source of revenues.
For a composition, these rights include:
the right to control the public performance of the musical composition;
the right to reproduce the musical work in copies or phonorecords (physical and digital formats);
the right to distribute copies of the musical work to the public;
the right to control the making of derivatives of the copyrighted musical work;
the right to control the public display of the work;
For a sound recording, these rights include:
the right to reproduce the copyrighted sound recording;
the right to prepare derivatives based on the copyrighted sound recording;
the right to distribute phonorecords of the sound recording to the public by sale, rental, lease, or lending;
the right to control the public performance of the sound recording.