By this time, it shouldn’t come as news to anyone who follows the classical music business that pianist Chris O’Riley has developed a fairly major side career as a keyboard interpreter of the works of the alt-rock band Radiohead. But to anyone who isn’t already a fan of the band, it can be difficult to put into words exactly what it is that O’Riley does with the preexisting material. “The songs are recognizable as Radiohead’s, but their materials are deconstructed, tweaked, expanded into new time frames, new structures, new expressive possibilities.”