Careful students of TiVO's scheduling guide have known for weeks that Dave scheduled Grizzly Bear to be his music guest tomorrow night, marking the band's first performance in the Ed Sullivan Theater (save the time they were indie rock choir boys ). Unfortunately the Late Show staff pulled a late minute flake out, deciding to "go dark" for the week. So reset the DVR for July 23rd, when Grizz will load in and perform a new song, tentatively titled "Two Weeks," from the already silly good follow-up to the Friend EP. Because of the date shift, Nico Muhly will no longer join them; instead they'll get key assistance from Footloose reimagineer Doveman. But wait, there's more. ...