Foo Fighters and Jane's Addiction cover 'Mountain Song'

At a Lollapalooza after show in Chicago, Foos hit the stage with special guest, Perry Farrell.

Perry is best known as Jane's Addiction's vocalist, but is also a Lollapalooza founder - go figure.

Perry joined the band for a cover of the Jane's Addiction tune 'Mountain Song', and it sounded pretty mint.