Speaking about the song's meaning, Passenger said: "'Hearts on Fire' is a nostalgic song. It's about when the timing with someone isn't right, even though the person might be. And although you're not with that person at the time, there may be a moment in the future where the relationship makes more sense."
The first single from Passenger's Whispers album, this was released on April 14, 2014.
When "Nothin' On You" reached #1 on the Hot 100, B.o.B became the first American act whose name is a palindrome to top the chart. The other two who did so prior to the Atlanta rapper were both Scandinavian groups - ABBA and A-Ha.
David Bowie's "Space Oddity" tells the story of an astronaut who cuts off communication and floats into space. The BBC used it extensively in their coverage of the 1969 moon landing - an odd choice considering the lyrics.