By genres do you mean various artist in a particular style (punk, classic, 80s etc) or do you mean a particular era of music? Ie do you mean a Zeppelin documentary or a historic film outlining the events leading up to the death of rock and the birth of punk? I think it's on Much More Music that they have one hour shows dipicting what went on musically for one particular year (ie '92 or '86 etc). There might be some more stuff on their website.