The closing night of Kid Rock's recent run of sold-out shows at Detroit's DTE Energy Music Theatre was one for the record books.

When Rock took the stage for the final night of his eight-show stand on Aug. 20, he was -- depending on your point of view -- either breaking or tying a record set at the venue in 1977, when Bob Seger accomplished the same feat. (As Classic Rock Magazine points out, the capacity has been increased over the years, so Rock played to more people than Seger over the course of his shows.)

But if Seger was at all unhappy about seeing his milestone eclipsed, he didn't show it. In fact, he took the stage with Rock for two songs ('Old Time Rock and Roll' and 'All Summer Long') during the encore. "I’m sure there’s more for us to do," enthused Rock after the show. "It was beyond mind-blowing. There’s definitely something there."

It's just the latest in a series of collaborations between the two Detroit legends, who have popped up at each other's concerts and on each other's albums for years. Earlier this year, they performed a pair of shows together in North Dakota and Minnesota that featured a set list that found Seger rapping with Rock on the latter's 2001 single 'Forever.' "Oh, that was so much fun, and I just thought it was so unexpected," laughed Seger later. "And the reaction in the front rows when we did it was just exactly what I hoped for. It was, ‘Oh my God, they’re doing this?!’ They just didn’t expect it, which is what you want to do. You really want to surprise people if you can."

We'll have to wait and see how many surprises Seger has in store on his upcoming album, which he's been recording in Nashville. He debuted a new song, 'All the Roads,' earlier this year. Other possible tracks include 'Gate of Eden,' 'Ride Out' and 'Wonderland,' as well as covers of John Hiatt's 'Detroit Made' and Billy Bragg and Wilco's 'California Stars.'

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