The qualities of a singer’s voice affect her ability to have success. A recording artist, for example, does not usually need the range and vocal power an opera star requires. Intonation, timing, rhythm, timbre and vocal abilities such as the ability to hit very high or low notes are all factors in the ultimate sound a singer can produce. Some singers may also need acting ability -- opera singers act out the story they sing and singers in music videos may also need to act.