Nas has several of these. Street's Disciple as we know it is a double album, but at one point, Nas scrapped the double album idea and it was a 22 track single disc. There was a planned sequel to "Get Down" on the album called "Get Up". It was supposed to be the first song. "Foul Breeze" (the Hi Tek track with the Busta beat), "Play On Playa and "Not Going Back" (both ended up on HHID) were all on the album. It also had two versions of a song called "I Am somebody" (one featuring Puff and remix produced by Organized Noize).
Nas also at one point had a triple disc in mind that were each based on the seasons. It makes sense, because Scarlet was originally named Winter. That's something else nobody mentions anymore: Nas rapping as a woman on two of the songs on Street's Disciple and people thinking it was Lil' Kim.
According to Salaam, they wanted to release the third disc, which was all dusty, street records.