After a couple of years of relentless touring, Humble Pie capitalized on their loyal U.S. following to capture the market with this, their fifth studio album. Although lead guitarist Peter Frampton was replaced by Clem Clemson – an excellent player – the band remained essentially the same. Led by singer/guitarist Steve Marriott's soulful wail, the group enjoyed a huge hit from this record, "30 Days in the Hole" – the track which defined the Pie's not-so-subtle appeal. The rest of the record is equally funky and intriguing. Stephen Stills guests on "Road Runner 'G' Jam," playing some nasty Hammond organ fills. In the end, though, the group defined themselves as the undisputed leaders of the boogie movement in the early 1970s, as a band.
Back in the 1970s Hawkwind set the template for powerhouse Spacerock and now Litmus have brought it up to date for the 21st century. Not a tribute band as such, but at times sailing dangerously close with material that would not have sounded out of place at a Lemmy-era Hawkwind gig - a heady cocktail of piledriver riffs that splatter your senses to the four winds, a cornucopia of cosmic noise to enhance the 'trip' into other worlds, and searing lead guitar runs the Captain can only dream of. A veritable sonic attack, that has appeared at Hawkfests and often gigged with Space Ritual in a mind-bending audio-visual extravaganza. Overall, Litmus is an excellent example of classic Spacerock and an essential purchase for all lovers of the genre.