It sounds like you're referring to the song "Let Her Go" by (whose real name is Michael David Rosenberg ), not Christopher Martin. However, Christopher Martin is a Jamaican reggae singer (lead singer of the band Morgan Heritage ), and he has covered "Let Her Go" as well.
If you meant an about the song "Let Her Go" (by Passenger) — perhaps one that explores its lyrical themes of loss, realization, or literary devices like paradox and irony — that could indeed be interesting. The song's central idea, "You don't know what you've got until it's gone," is a classic motif in both psychology and literature. christopher martin let her go