Folk music, that's a bit progressive. I guess some might recognize him from the vocals on "Have a cigar", but anyways, his best known release,
Stormcock would be a good starting point and would best represent his music. Has an excellent voice, some great lyrics and his guitar work is really versatile. His voice and expression keeps changing a bit, depending on the mood of the song.
Although It's only four tracks, most of it is too long to be uploaded on youtube. I'll upload a compilation soon...when my net stops acting weird again.
I think one of the songs could be uploaded, as it's below 10 minutes.
YouTube - Roy Harper - One Man Rock 'n'n Roll Band
The rest of the album is more or less in similar vein, only better. Just look up on the related videos.
MySpace