I think good music is more universal than subjective. I can listen to an album from an unknown artist and easily pick out the hits from the filler. By hits, I mean ones that reached top 100 in the charts. I would assume most people with varied taste in music can do the same? Then there's world music which has no charts. Even there I can pick out the good tunes from the boring ones easily. But would people agree with what I picked? I think so because of what I wrote above in the first paragraph.