On Oct. 26, the first major crop of Christmas releases arrived, from John Legend, Gwen Stefani and Pentatonix. But with the holiday itself over two months away, what’s the rush? “The straight answer is the physical market,” says John Fleckenstein, co-president of RCA Records, Pentatonix’s label. “Christmas albums tend to be multigenerational, and thus, they skew very heavily on the physical side.” He explains that in the United States, stores like Target and Walmart start holiday in-store marketing and positioning around Nov. 1, “so anybody who’s going for a broad-base national play with their album will need to get a physical version into stores by the end of October.” Pentatonix’s previous Christmas release, 2017’s A Pentatonix Christmas, hit No. 1 on the Billboard 200, and now, according to industry…