The `Twilight` actor originally considered becoming a musician and is making the most of a break in his schedule by heading to the studio to record his first full-length record.
A source told UsWeekly.com: "Music is his first love! He`s tortured because he avoids it. When he`s sitting around jamming in the studio, it`s his favourite moment of life."
Another friend added: "Rob has been kicking a few original songs around for a long time, but his schedule didn`t allow it.
"Now he`s got some weeks to get everything in line before going back to promoting `The Twilight Saga: Breaking Dawn`."
The 25-year-old actor previously recorded two tracks, `Never Think` and `Let Me Sign` for the original `Twilight` soundtrack.
Sources say the sound of the album will be "organic" and use traditional instruments.
The friend added: "The album Rob will make will be guitar based and drums, very organic-sounding, nothing pop. Like stripped-down Ray LaMontagne meets Van Morrison."
Robert`s `Twilight` co-star, Jackson Rathbone, has previously praised his ability as a guitarist. He told how Robert "loves to play the blues. He can hold his own on a guitar. We enjoyed jamming together when we had the time. Very humble and quiet guy."
Robert has also said he loves playing piano, and as a child hoped he could make a living from it. He said: "I love the piano. I never really had any aspirations to be an actor when I was young. I wanted to play the piano in a bar, to be the old dude with a whiskey glass."