Jason Mraz has revealed there is a dark side to his music - but his fans may never hear it.
The singer-songwriter, known for feel-good hits like I'm Yours and The Remedy (I Won't Worry), said he's recorded a ton of heavier tunes that remain on his laptop.
He chooses not to share them with fans, partly because he doesn't want to tour with loads of sad songs.
In the process of creating the positive tunes, he says he comes up with the depressing ones first.
"I have to get a lot of out me first before I can get to that place ... where I can choose to celebrate life," he said. "It's those celebrating songs that end up on the album."
Mraz, 33, said he would like release his melancholy material, but is still searching for the right way to present it.
He has an eight-year-old song that he calls both "beautiful" and "heavy", and he's re-working it so that it may one day be released.
"I'd rather uplift and inspire, and you can also do that in darker tunes," he said. "I have to carefully place those and I feel the fewer, the better."
His new album, Love Is A Four Letter Word, has its more serious moments. I Won't Give Up, the first single and US Billboard Top 10 hit, is about his break-up from his fiancee, which he wrote to help him figure out what was going on in his life.
"I knew there were some things I believed in that I didn't want to give up on, and this song was proof to me that I was working through it," he said.