The Mystery Trend's name has proved appropriate in defining their fate. They were a band that lots of rock music scholars have heard of -- mentioned in lots of essays about San Francisco in the mid-'60s -- but never heard. Even the Charlatans, another Bay Area band that barely made it out of the starting gate where records were concerned, are better known, by virtue of their music having bounced in and out of print from various sources over the past 34 years. The Mystery Trend never recorded much professionally, and a lot of what they did was in the realm of works-in-progress,...