An infomercial is an advert that is longer in length than the usual 30-second advert you see on TV. The length of an infomercial is in minutes rather than seconds and can be the length of a programme.
The point of an infomercial is to educate the viewer whilst having a strong bias on advertising / selling a product or service. A great example can be found on shopping channels such as QVC.
Music and voice-overs can be used to enhance an infomercial.
High quality royalty free music can be suitable for an infomercial, however, if a brand message needs to be communicated or if you require exclusive use of original music, you may wish to hire a composer to write a custom piece.
Voice-over, high quality royalty free music & custom written music is all available on Media Music Now