Starting wages may be small in recording studios, and many beginners work as unpaid volunteers. Experienced engineers, especially those who have worked on a hit record, may command a large wage. Some engineers are paid a salary, while others may earn hourly pay (sometimes based on the studio's rates), or be paid per session. Many go on to start their own recording studios, or maintain a private studio or mobile recording service. A few work only for a single recording artist, band, or producer.