 Sigur Rós' EP consists of the songs the group composed for an American dancer and choreographer who was at the forefront of the American modern dance for more than how many years?
Ba Ba Ti Ki Di Do: Ba Ba Ti Ki Di Do is an EP by Sigur Rós, released in 2004 by Geffen Records. Ba Ba Ti Ki Di Do:  The EP consists of the songs the group composed for Merce Cunningham's dance piece "Split Sides", which also involved Radiohead. Merce Cunningham: Mercier Philip "Merce" Cunningham (April 16, 1919 – July 26, 2009) was an American dancer and choreographer who was at the forefront of the American modern dance for more than 50 years.
i don't know