Starting a PFM station, I, of course, received a good mix of both, which was not the intention.
This is definitely a problem that has been and is easily solvable. For instance, if there's a conflict in genres per album, and the genre is "way off" (like "progresive rock" versus "drum and bass"), then prompt the user to do one of N things [in this case: "did you mean: PFM progressive rock? PFM drum and bass? or just mix them both?"