Rock Bottom

Michael Schenker and Phil Mogg are credited with the song. The studio version is track five of Phenomenon at 6:32 on Wikipedia and 6:22 on Songfacts. Schenker says it continued the idea of the title track "Lonesome Crow" that he recorded with the Scorpions; he wanted a song in which I could improvise and go on an adventure. It began as a rehearsal riff, others were added, and Mogg proposed the structure; Schenker calls it a work in progress and still plays it. Songfacts adds that the middle section is built for free improvisation and that in 2008 Mogg said the lyrics were inspired by a horror film whose title he had forgotten. It was not a 1974 single; a 3:38 single edit appears only on the 2019 deluxe set.

The live version on Strangers in the Night (January 1979, produced by Ron Nevison) runs 11:08, side three track nine, the longest on the album, recorded between October 13 and 18, 1978 at venues including the International Amphitheatre in Chicago and Louisville Gardens; Songfacts calls it the high point of the live album. Wikipedia reports that Schenker said there were better takes they could have used. Setlist.fm lists it at 845 plays across 1,980 UFO setlists, third behind "Lights Out" (887) and "Doctor Doctor" (883), and Schenker's own setlist.fm page lists it second with 388. A 1998 reunion live album, Werewolves of London, has Schenker closing with it, per a search summary. We found no covers or samples, and our upload carries only the title, so we cannot say whether it is the studio or the live version.