Pianist Christopher O’Riley has a passion for the guitar band Radiohead. He’s been arranging about a dozen of the band’s songs and performing them in his otherwise classical concerts and playing them during the intermission of “From the Top,” his public radio music show. “Both classical musicians and Radiohead enthusiasts have taken note of O’Riley’s obsession; his work is drawing notice from concert promoters and it’s won him a following via the Internet among rock fans who normally would never set foot in a recital hall.”