For DMB, this song began as melody played in Butch's solo as a Dreamgirl outro on 8.20.05
. The next night
, they replaced Steady as We Go with an "improv" full version of the song.
"Blackbird" originally appears on the Beatles's 1968 eponymous album
, a.k.a. The White Album
. It is credited to Lennon/McCartney, like most of the Beatles's songs, but was written by Paul McCartney.