Jackson: It’s fun because we play a family on screen and so getting to come back and do these sequels is like a family reunion. A lot of us are musicians as well as actors so we’d all get together in the rooms and we’d have jam sessions and make up songs. I’d play guitar and harmonica, Rob would play guitar and sing or Kristen would play guitar.
SNMag: Do we get to see a new side of Jasper in Eclipse?
Jackson: Yes, we get to see Jasper back when he was a human which was back in the Civil War. So I got to ride a horse again - I grew up riding so it was fun to get back to that.
Read the entire interview at the source