For Portland bicycle commuters hoping that TriMet would build a “sonic bike path” connecting to the nation’s largest car-free bridge, Thursday was the day the music died. The idea was for an intricate sequence of concrete grooves on the path that would play Simon and Garfunkel's "59th Street Bridge Song (Feelin' Groovy)” when bicycle tires rolled over them. . . . Citing concerns about cost, safety and design, the Portland-Milwaukie Light Rail project’s art advisory committee told TriMet and Portland’s Bicycle Advisory Committee today that it has voted to ditch the proposal.