John “Feldy” Feldmann, producer of Blink-182’s new album, California, has revealed that the band’s new song, “San Diego,” is about former member Tom DeLonge.

Feldmann confirmed the news in a track-by-track analysis feature on FUSE. “it was a song that Mark didn't want to write,” he said. “I brought up the idea that you have to write about shit you don't want to write about.”

Listen: Hear a B-side from Blink-182's new album

He continued, “You have to write about shit that's right there on the surface. There's clearly a lot of feelings involved with having a best friend who is not in your band anymore; having a best friend with all that stuff that went down.”

You can read all of what Feldmann had to say about the track below. California was released this past Friday. The band’s arena tour with A Day To Remember, All Time Low and the All-American Rejects begins later this month.

“The history of the song [is about] growing up in San Diego, having so many of their work partners being from San Diego and having a member who lives in San Diego who is no longer in the band…it was a song that Mark didn't want to write. I brought up the idea that you have to write about shit you don't want to write about. You have to write about shit that's right there on the surface.

There's clearly a lot of feelings involved with having a best friend who is not in your band anymore, having a best friend with all that stuff that went down. Every band has these issues. To write a song, now, in their minds, to go back to San Diego, playing shows and tipping their hat to the city that allowed them to be a band… to me, Blink put San Diego on the map. If you think of its geographic location, they're the band that made San Diego relevant as a city. I say that with the utmost respect to San Diego because I was born in San Diego, I grew up in San Diego but no body gave a fuck about San Diego. It was just like a place and suddenly Blink happened and it was like Seattle.

The song acts as a bittersweet homage, a goodbye to this city that none of us live in anymore but owe so much to, while acknowledging the interpersonal relationships within the band.”