A solid enough entry in the Discworld series but not one of the very best. Soul Music is something of a rehashing of previous books with the plots of Mort, Reaper Man, and Moving Pictures combined. Once more Death is off exploring another aspect of humanity which leaves a void to be filled by Susan as others have done previously in Mort and Reaper Man while the rest of the plot is tied up in the idea of Rock Music invading the Discworld much as the film industry did in Moving Pictures. There's even Dibbler heavily involved in the production and extraction of money from pockets on an industrial scale once more. 

It riffs (hurr hurr) very heavily on the rock music angle with references galore and puns packed throughout the book which means mileage will vary depending on how much an individual cares about the rock and roll. Overall it was interesting, funny, and fast paced but there's no denying that I found Death, Susan, and the Death of Rats far more interesting than any of the main musical plot which while enjoyable enough did feel like Moving Pictures 2.0 but with more refinement and better jokes.