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In April, about a month before he released his second Domino album, Rocket, Philadelphia experimental rocker Alexander Giannascoli altered the stage name he’d used since 2010, adding “(Sandy)” to “Alex G,” the parenthetical a reference to the first song he posted on Bandcamp way back in June 2011. As Spin magazine discovered, LA musician Alexandra Gronlund had put a trademark on “Alex G” in late 2015, forcing Giannascoli to make an awkward adjustment just as he was about to take a big step in his career.…