Pop music is a subgenre of popular music characterized by upbeat rhythms that are easy for people to dance to. Pop song lyrics typically focus on themes of love, loss, emotion, or dancing. Unlike other popular music genres, pop songs are usually written by professional songwriters and popularized by singers. The promotion of pop music in the 1980s was greatly influenced by the rise of music television channels like MTV, which featured artists like Michael Jackson, Madonna, and Prince who had strong mass appeal. The Beatles helped reshape Western pop music and were the most successful band ever, releasing many hugely popular albums from 1963 onward that helped create a distinctly British pop sound.