SiA has tweeted today that she doesn’t know what Yeah Ghost is. Yeah Ghost is the name of the new album “her band” Zero 7 is releasing very soon. SiA has been on every Zero 7 album. She had lended vocals and other skill to Simple Things, When It Falls and The Garden. She may be to expensive now that she is working with Christina Aguilera. Or maybe the chill-out duo wanted to delve into  another direction and not invite SiA back. This comes as a shock though, because she might have known that they were back in the studio. Instead, the new album will feature vocals by Eska Mtungwazi, Martha Tilston and Rowdy Superstar. To tell you the truth, it’s a sad day for Zero 7 if SiA is not on the record.