A grand piano that has been featured on many of ABBA's biggest hits, including "Dancing Queen," is set to hit the auction block at Sotheby's.

London auction house expects to sell the instrument, which is owned by the Stockholm music studio where the group often recorded, for between $900,000 and $1.2 million.

The auction is due to take place on September 29. The piano is accompanied by a certificate of authentication signed by ABBA pianist Benny Andersson in 2015.

Andersson says the piano was "one of a kind" and a "great source of inspiration while working in the recording studio."

Dr. Philip W. Errington from Sotheby's said, "The opening piano glissando from "Dancing Queen" is one of the most distinctive sounds of the seventies and we are delighted to offer the actual instrument used by the legendary Abba in their major recordings."