Among the bigger surprises of an already packed Record Store Day slate is seeing labels increase their presence within the usual offerings. One such case: BMG, a company steadily growing in prominence since corporate owner Bertelsmann sold a four-year stake in Sony Music and started rebuilding with a host of classic rock, pop and other catalogues as well as new releases from those acts. This year, the company has prepped a baker’s dozen special vinyl titles for the RSD festivities on Saturday, April 12, drawing from a list of well-known acts or…