Frankie Goes To Hollywood are a well-known British band from the 1980s. Asides from both commercially-released albums, the band had a lot of 12" mixes and unreleased demo mixes (or completely unreleased tracks).
Mark Ward has putten up 1-minute excerpts of many of these unreleased tracks on his website, but as they are Flash-powered they will be obsolete soon: www.frankie-say.net/mycollectiondemos.htm
Many fans regularly claim for a full release of their demo recording of Grace Jones' "Slave To The Rhythm" (indented to be performed by them, akin to what Come And Get It by Badfinger was for The Beatles), this demo has surfaced online but possibly incomplete. The "Peter Gunn" demo version of Lunar Bay also gets the same treatment.
Ones that are commercially released include "Our Silver Turns To Gold" (featured on the Frankie Say Greatest compilation), studio recordings of the Montreux 1986 performance, Delirious, and serval demo mixes (all on Liverpool Deluxe), "Watusi Love Juicy" and early mixes of Two Tribes and War (on Pleasuredome Deluxe), "Do Ya Think I'm Sexy?" (on Sex Mix and the digital release of Frankie Say Greatest) and "Every Kinda People" (on Frankie Said (Japan Edition) and the digital release of Frankie Say Greatest), among others (Does "Is Anyone Out There? (Movement 2)" count?).