. "HT:Politico.Most 'transparant' administration White House visitor logs leave out many.A foot of snow couldn???t keep Bob Dylan, Joan Baez, Jennifer Hudson and other celebrities away from a star-studded celebration of civil-rights-era music, hosted by President Barack Obama and first lady Michelle Obama at the White House in February 2010.Dylan???s haunting rendition of ???The Times They Are a-Chan" . . . . .