A title sequence presents a film or television program's key credits at the beginning. It typically lists the production company, director, producer, executive producer, and top billed actors. The credits are usually shown over footage from the program while music may play. Title sequences follow a generally consistent order and style for credits but can vary in their specific transitions and placement of certain roles. For example, the producer may be near the end in some but the costume designer is often early. They aim to credit the important contributors while setting the tone for the program through imagery and music.