This list assumes, of course, that you already have a computer. You don't need the fastest computer to record and mix music, but it should be reasonably fast. Anything with a Core i- or even Core 2-series processor should do the trick. Just don't use a netbook.
Ashford & Simpson also had success writing for themselves: Perhaps the best-known song they sang was the 1980s hit Solid As A Rock.. His music is unmatched in terms of great songwriting, Verdine White of Earth, Wind and Fire said after learning of his friend's death.
Harlem Shake was released commercially in June 2012. Mad Decent commissioned a music video for the single at the time, but were not satisfied with the result and shelved it. It gradually received listens online, and was re-released as a single on January 8, 2013.