This was the last song Audioslave wrote before they broke up in 2007. Revelations was originally complete with 11 songs, but producer Brendan O'Brien insisted he wanted a big, loud closer for the album. The next day, the band came up with "Moth."
The last lyrics Chris Cornell ever sang for Audioslave were, "I won't fly around your fire anymore," before he left the band to pursue his solo career.
"Lean On" was originally sent by Major Lazer to both Rihanna and Nicki Minaj's camps as a slower reggae track. After both parties rejected the tune, Major Lazer recruited Danish singer MØ to supply vocals and recorded it themselves.