Rumours Deluxe Edition question

[bwboy]

I just noticed this the other day and wanted to know if anyone else noticed it; the live CD that came with the Rumours Deluxe Edition a few years back- at the beginning of the Concert that was recorded during the Rumours tour, Tusk is playing in the background. Tusk, of course, was recorded years after Rumours was released, so my question is, how could it have been played during this concert? Was Tusk the song something Lindsey had well before Tusk the album? Or was the introduction recorded at a different concert and year than the live CD?

Any ideas?