Each new celebrity guest Taylor Swift brings on stage during her ongoing 1989 tour appears to be an escalating exercise in the pop star’s impressive knack for a non sequitur. (We’re still not quite sure how Friends actor Matt LeBlanc or comedian Chris Rock pertain to… anything Swift is doing these days). But at least last night (Aug. 24) when, during her third night of concerts in L.A., Swift brought out Alanis Morissette for a performance of her Jagged Little Pill hit, “You Oughta Know,” there was actually a substantial connection there.

Both Swift and Morissette have penned devastating and acerbic songs about heartbreak and, accordingly, have been reduced to so-called jilted “crazy girls” turned songwriters -- ultimately giving “You Oughta Know” a rightful home on Swift’s mega-1989 production. Swift addressed as much in her introduction (via Us Weekly):

I think it’s fair to say that so many of the female singer-songwriters of my generation, including myself, would not write the way we do without her and her music. And she has written some of the most brilliant music -- in particular probably inarguably the greatest breakup song of all time.

Watch the two singers perform "You Oughta Know" at the Staples Center in the videos below:

Morisette’s appearance is also not coincidentally timed with Jagged Little Pill’s 20th anniversary. The Canadian singer will reissue a deluxe collector’s edition on Oct. 30.

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