Western vocal may be defined as singing that is structured and developed in Europe, the United States, and other societies established and shaped by European immigrants. This includes a wide range of musical genres, from classical music and jazz to rock-and-roll and country music. Some of these are monophonic, meaning it has a single line of melody. Another form is polyphonic, meaning several melodies are sung at the same time.
Additionally, you might also come across Cappella that uses just the human voices with no instrumental accompaniment. Some types of Western vocal music are created specifically for groups of people.