Less than three weeks after his split from Jennifer Aniston, John Mayer had love on his mind at a charity bash on Thursday night.

The singer debuted a new song called “Half of My Heart” that he said he finished writing just hours before the show. The lyrics included the lines: “Half of my heart is a shotgun wedding to a bride with a newspaper ring/Half of my heart is the part of a man who knows he’s never really loved a thing.”

After the show — which also included performances by Gavin Rossdale and Jordin Sparks — John reflected on the evening in a Twitter post, saying: “That felt great to play again. ‘Half Of My Heart’ felt pretty good. Gonna tweak it a bit.”

John didn’t share the inspiration behind the song, but it does come at an interesting time as he ended his year-long relationship with Jennifer earlier this month — just weeks after their much-publicized coming out appearance at the Oscars.

Days after their split was announced, he also took to Twitter, declaring: “This heart didn’t come with instructions.”

Thursday’s event, benefiting VH1 Save The Music Foundation, was held aboard a cruise ship at the Port of Los Angeles pier in San Pedro, Calif. On Friday, John set sail on his second annual Mayercraft Carrier tour — a five-day cruise from Los Angeles to Cabo San Lucas during which he and several other musical guests perform.

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