Rolling Stone ran an excerpt from R Kelly’s upcoming autobiography, “Soulacoaster: The Diary of Me,” and in the chapter titled “Yo Pac! Yo Biggie!” the singer/songwriter/producer expresses his sincere respect and admiration for the two slain rappers.The Pied Piper recalls a 1996 meeting with “˜Pac in front of a hotel frequented by rappers and other music industry types. He says they planned to release a collaborative album at that meeting, but the idea came to a tragic end after Shakur was murdered later that year.”Come September, and it looked like my schedule was opening up just before the holidays. I set up a meeting with Pac for us to plot our strategy, get firm dates and make the musical bomb that we both know would explode all around the world,” Kelly wrote. “But another bomb exploded that no one saw coming.”We all wonder what could have been…