As the original uploader of one of the videos you linked, I uploaded them to Mediafire. The links are on this thread: http://www.anime-sharing.com/forum/music-request-44/%5Breq%5D-fortissimo-osts-albums-374359/
Not sure if uploads from Mediafire are allowed, but here they are:
fortissimo Soundtracks:
http://www.mediafire.com/download/hcyjctjbaasbhce/1.+fortissimo+%EF%BC%8F%EF%BC%8F+Akkord+Bsusvier+Original+Soundtrack+%5BMP3%5D.rar...