This youtube video has much better sound quality of the "Think About Me" performance in Sydney.
https://www.youtube.com/watch?v=PwnoXMWgFrU
The harmonies are especially good. Wow, Christine can still reach those high notes.
I also like that I can hear her introduction: "It was released as a single but I don't think it terribly well, but we don't care..." Funny: "Think About Me" reached the exact same chart position as "Over My Head"--the song they replaced in the set. But I suppose a peak position of 20 in 1980, after a string of top tens, might have seemed a bit minor in comparison to when the band's first single reached 20.