This collection is good value for the price. However, not all of the songs are twelve-bar blues. There are also some 'bluesy' 32-bar songs. Some classic blues songs are missing (e.g. Backwater Blues). The 'professional' (open flat) binding is handy, but the margin isn't wide enough for that type of binding to work well. So the outer edges of some songs are clipped off or difficult to read.