Madonna changed the trajectory of popular music not long after "Borderline" became her first Top Ten hit in 1984. Fusing post-disco dance with effervescent pop, "Borderline" seemed unexpected and fresh, a trick that soon became her signature. Over a career that lasted for decades, Madonna ushered underground sounds into the mainstream, specializing in trends percolating in dance clubs. As she arrived at the dawn of the MTV era, she seized the possibilities of music videos, creating a series of sexy, stylish clips that earned her the reputation of a provocateur while also establishing the network as the bastion for hip culture in the 1980s.