As part of PBS’ local pledge drive, American Masters showed a rerun of an April 2003 program last night; it was a profile of Joni Mitchell (those of you saying, “but she’s Canadian!” are quite right…I wondered how she qualified too). I missed some of the gossip back in ’69-’70; I had no idea she and Graham Nash were lovers. Apparently she wrote the “Blue” album post-breakup. If you’re “of a certain age” and you missed it, it may be re-broadcast in your area, and it’s worth your time.