The Trouser Press Guide entry sums it up:
At first glance, Frank Sidebottom is just an idiotic soccer fan from Timperley (a town just outside Manchester) who performs inanely nasal renditions of popular songs — accompanying himself in various musical modes, from rock to acoustic piano to a rinkydink synthesizer approximation of '20s ragtime — while wearing an enormous painted papier-mâché head. But what Chris Sievey (former leader of the equally prolific punk-era Freshies) has done as Frank Sidebottom is so completely over the top, so singlemindedly weird, funny and charming that one has to marvel at the wit and intensity with which he pursues his bewildering career.Well, quite. And anyone who puts out an album entitled Frank Sidebottom Salutes The Magic Of Freddie Mercury And Queen And Also Kylie Minogue (You Know, Her Off Neighbours) earns a place in my book.
That's not even counting his bloody-hysterical covers of "Summertime Blues" (as "Timperley Blues") and "Last Train to Clarksville" ("Next Train to Timperley", of course), or his "indie medley" which smooshes "Love Will Tear Us Apart", "How I Wrote Elastic Man", "Take the Skinheads Bowling", and "Bigmouth Strikes Again" into a single... uh, edifice.
The world will be less funny and less strange for his passing, and that's never a good thing.