Joan Osborne and the Blind Boys of Alabama will be join The Allman Brothers Band tonight at the Beacon Theatre. Osborne posted the news yesterday on her Twitter account. As previously reported, John Popper also tweeted that he will be sitting in with ABB tonight as well. This isn’t very surprising considering the fact that Popper and Osborne are old friends, and Popper has joined the Allmans on 31 occasions since 1990.