Foo Fighters at Black Cat: 3-hour show has all the hits, others' hits and 'keg party' vibe

It's hard to think of Friday's super-surprise Foo Fighters show at the Black Cat as a homecoming for frontman Dave Grohl. Beloved as the Northern Virginia ex-pat and current Los Angeles resident is around here, he hasn't ever given those left behind a chance to dwell on his absence. Grohl has long seemed to be everywhere at all times. He's as much a fixture of televised awards shows as the red carpet. His band just spent a week-long residency on David Letterman's "Late Show." His own TV series d...