It was just the next logical step from making succinct pop songs. What do you do after that? You make pop songs that are longer and more epic, that push the envelope. Imagine your favourite song, or something that you play over and over in the car, except that you don't have to start it over as much.
My family was always playing music; I always enjoyed it. My cousin, who is a little older than me, he started playing music, so I wanted to, also. I asked my dad for a guitar, and he got me a banjo, so that was my introduction to playing. I played it like a guitar. I had a few lessons, learned out a few chords, and figured it out right away.