Soul Music is notable for having numerous allusions to various aspects of the music industry, including groupies, music-recording devices, and most notably the history of rock and roll. The Geeky Guide To Everything noted "Each new number depicted a different aspect or period of rock music ranging from the likes of beat music all the way to the Beatles. And this made for an entertaining musical and visual experience". PopMatters notes "the whole adventure is a parody of the music industry in the world outside of the story". Terry Pratchett said "Rock and Roll is sung about and talked about as though it is some kind of a living thing – it won’t fade away, it’ll never die. It has a meaning quite apart from a particular type of musical sound, and then consider the large number of people to whom it offered tremendous fame for a few years and then sudden death, as if there was some kind of devil’s bargain going on." The series takes the association of the "Band with Rocks In" with
the Beatles even further than the book does, evolving their style from 1950s rock and early 1960s
beat music (and mixing-bowl haircuts) in Ankh-Morpork, to
acid rock in Scrote, to spiritual hippie rock in Quirm. In Sto Lat, they sound like the
Jimi Hendrix Experience or
Bad Company, but are dressed in clothes similar to the Beatles on the cover of the ''
Sgt. Pepper's Lonely Hearts Club Band'' album. Also in Quirm, Buddy says that the band is 'more popular than cheeses,' referring to
John Lennon's famous quote proclaiming the Beatles to be
more popular than Jesus. In Pseudopolis, their outfits and style resemble the
Blues Brothers. Crash's band is also given the name "
Socks Pastels". ==Differences from the book==