Erm, isn't a cameo a one off appearance? If it is then Bon Jovi's shouldn't really be there, he was in it for an entire season.
I haven't most of these but i agree about Geri's appearance in Sex and the City. It was pretty bad.
I don't think it would count but I think Michelle Branch's appearance in Buffy was pretty good. She didn't act, just sang. But she sang a song called "Goodbye to You" which was emotional at the time because Giles was leaving and Tara was breaking up with Willow. It's not my favourite show in the world but i watch it sometimes and thought that bit was very well done.
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