Eminem and Snoop Dogg have teamed up for a new Detroit to Long Beach track, “From The D 2 The LBC,” the first-ever collaborative effort from the two veteran rhymers. “This probably should have happened awhile ago,” Em says at the top of the song, before trading verses with Snoop over the Eminem-produced instrumental, built on a spare drum beat, strings and an operatic vocal sample. Em and Snoop have teamed up before, on “Bitch Please II,” a posse cut from Eminem’s 2000 album “The Marshall Mathers LP,” which also featured Dr. Dre, Xzibit and Nate Dogg. “From The D 2 The LBC,” which hit streamin…