Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A good introduction to the soul catalogue

The reviews have been rather harsh of Peter Shapiro's Rough Guide to Soul. It is a good introduction to soul. Shapiro is well-informed about the music. I found interesting information about the Meters, Ann Peebles and James Carr some of the unsung heroes of soul. The main criticism of the book is that it includes lots of greatest hits selections. I think this really isn't fair because in the 50s and 60s soul artists concentrated on hit singles not albums. Shapiro is right to focus on the Greatest Hits as the best works. Remember it is just an introduction and if you really like the music you can start investigating the back catalogue. Shapiro's book is a good starting point to investigate the wonderful world of soul.