The name of Dan Penn might not be well known to the general public, although several of the songs that he's helped write are soul standards – Dark End of the Street or Do Right Woman, Do Right Man, for instance; aficionados have long been aware of him thanks to Peter Guralnick's classic account of the Muscle Shoals scene in the 60s, Sweet Soul Music. In the appendices of that book, Guralnick recommended a whole bunch of discs and bootlegs for fans' listening pleasure; but while he raved about the early demos Penn recorded at Rick Hall's FAME Studios, even in the era of Spotify they have always proved frustratingly hard to come by – until now. So does this 24-track collection constitute the sine qua non of blue-eyed soul? Listen to cuts like Rainbow Road and You Left The Water Running (both substantially different to more familiar versions), and anyone will answer: you betcha.