vocaloid

Vocaloid technology has improved dramatically and the expressions and audio quality of Vocaloids have improved to the point where it's hard to tell the difference between them and living human beings. Not only does it allow for users to easily create songs and cover songs for their enjoyment, but it is progressing to allow users to make full-scale musical pieces as well.
Furthermore, there are little restrictions on hardware as long as they are connected to the internet, so there are many possibilities for future uses including for mobile phones and portable game machines.