the genre for these songs is doujin music...
here's from wiki: "Dōjin music isn't a musical genre in itself but is indicative of a particular publishing way, like the term "indie" would be.
Dōjin music consists very often of video game music fan arrangements. Much original music is also created, be it music for dōjin games or simply mainstream music such as pop, rock, techno or trance.
By nature, dōjin music is most often reduced to synthetic digital productions which allow for self-production at low costs, as opposed to studio mastering live instruments require. As much as full live instrumentations are rare though, it is pretty common to have one live instrument such as a guitar backed up by synthetic orchestrations."
do you read or watch my post?            hehe ;D        I allready postet Takayoshi's vid...      I suggest to watch my recommandations         ... my postet songs are all awesome =)