Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Feedback is the 5th album by the rock & roll band Spirit. Released in 1972, it was the first Spirit album without original members Jay Ferguson and Mark Andes, and it was also the only Spirit album that did not feature Randy California performing on it, as California had left the group to pursue a solo career. Feedback reached the same chart position on the U.S. Billboard Magazine album charts as its predecessor, Twelve Dreams of Dr. Sardonicus.