"hey there delilah" is an acoustic song, first released as a single in may 2006 as chasing cars, and was the last track in the band's first album, all that we needed. one year later, in 2007, the song became the band's first mainstream hit. on 11 july 2007, the song reached number one for sales in the billboard hot 100. one month later, the song became a hit single all over the world. "hey there delilah" reached number two in the uk singles chart and ireland singles chart, number four in the australian chart and number six in the united world chart. its popularity made it to #1 in other countries like germany and canada.