Prince pioneered the Minneapolis sound, a funk rock subgenre that emerged in the late 1970s. He had a prolific output, releasing 39 albums during his life, with a vast array of unreleased projects left in a vault at his home after his death. It is believed that the vault contains dozens of fully produced albums and over 50 music videos that have never been released, along with various other media. He released hundreds of songs both under his own name and multiple pseudonyms during his life, as well as writing songs that were made famous by other musicians, such as "Nothing Compares 2 U" and "Manic Monday". Estimates of the complete number of songs written by Prince range anywhere from 500 to well over 1,000.