For an one-time performance of their former band Joy Division song New Dawn Fades, New Order teamed up with Moby, Billy Corgan and John, who taught Bernard Sumner and Peter Hook how to play their own song again after 18 years in the dressing room. This later ended up being mixed by Moby for the soundtrack of the 2002 Madchester-chronicling film, 24 Hour Party People.

At the end of year 2000, John held a private show backed by Flea and Josh Klinghoffer as a tribute to Darby Crash, the late singer of Germs.

John joined Blonde Redhead onstage and jammed with them during the encore.

Still, an one-time Joy Division cover band consisting of John, Flea and Josh performed a single show at Spaceland in 2000. John did his best impression of the late Ian Curtis and one of his guitar heroes Bernard Sumner, both musically and style-wise.

H.A.T.E. had more visitors at this show, once it was known that John and Flea are indeed a part of the band (rumour says that previously many people assumed they were just lookalikes!).

H.A.T.E.'s low-key gig - sweaty, barely dressed, with a lot of covers played.

One of the concerts John played with Thelonious Monster prior to joining RHCP. The concert was divided in two sets and, apart from guitar, John also sung on Gut Feeling.