Two singles were released from "Medúlla": "Who Is It" and "Triumph of a Heart", with both charting inside the top 40 in the United Kingdom and the top 10 in Spain. Björk further promoted the album by performing at the 2004 Summer Olympics opening ceremony, "Friday Night with Jonathan Ross" and other television and radio shows. Other than these few performances, no concerts or tours were arranged to promote "Medúlla", as Björk thought it would be too difficult to play the songs live. In 2015, the album was adapted into an opera at the Brussels opera house La Monnaie by Sjaron Minailo and Anat Spiegel.