The recording of Madonna's 'Gang Bang' was interrupted by an impromptu trip to watch a sunset.
Talking as part of some EPK thing for 'MDNA', William Orbit said that Madonna suddenly declared a desire to see the sun which resulted in the pair standing in the middle of a Manhattan street with Madonna singing songs from musicals.
This 'sojourn' inspired Madonna to then go back to the studio and record an "incredible vocal" that "just came pouring out".
You can watch the whole EPK thing here.