"Bonzo's Montreux" is a drum solo by Led Zeppelin drummer John Bonham.
It was recorded in September 1976 at Mountain Studios in Montreux, Switzerland, with electronic effects added by Jimmy Page.
[1] Page used the then-new Eventide Harmonizer to create a steel drum sound, which Bonham apparently liked; the final "gliss-phrases" were developed during mixing with the Harmonizer's keyboard controller.
[1] In a contemporary review of Coda, Kurt Loder of Rolling Stone gave the track a positive review, praising Bonham's "drum orchestra" and the electronic effects added by Page.
[4] Loder further described the track as being "true to the spirit of Sandy Nelson, and thus vestigially nifty at the very least.