Band say they turned down request from ad agency to license song
Track is due to be released as part of Record Store Day celebrations this Saturday (April 21)
Duo's Village Underground show sells out in an hour
Band's fourth record is set to drop on May 14
Taster from forthcoming new LP 'Bloom' surfaces online
The Low Anthem, Veronica Falls and John Grant will also appear on August 31
Electric Lady Studios have suggested that the duo have finished their fourth LP