“Frightened Birds Head House” is a compilation. It is not a “sampler,” a term that implies the practical function of serving as a label’s calling card. (…) Toward the end of the 1970s, records and cassettes made by independent record shops and individuals rather than large corporations—ones that required little more than a name, a logo, and something they wanted to release—were also playing that role, whether or not their creators intended them to. In Manchester, there was Factory. In Brussels, …