Operatic pop or popera is a subgenre of pop music that is performed in an operatic singing style or a song, theme or motif from classical music stylized as pop. The subgenre is often performed by classical crossover singers and acts, although that field is much broader in the types of music it encompasses.
American pop is pop music in the United States. American folk singer Pete Seeger defined pop music as "professional music which draws upon both folk music and fine arts music". An early genre of American pop music was the swing craze, a popular dance style in the early part of the 20th century.