Disraeli Gears marked the arrival of the man who became essentially a fourth bandmember in Cream, Felix Pappalardi.  He was the record producer on this album and the next two, and Pappalardi plays many different instruments (often uncredited), particularly on Wheels of Fire.  With his wife Gail Collins Pappalardi, Felix Pappalardi also wrote two songs on this album, "Strange Brew" and "World of Pain".